Wangzj

AndroidStudio_projects/.gitignore

@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

AndroidStudio_projects/.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

AndroidStudio_projects/.idea/.name

@@ -0,0 +1 @@
+Hamburger

AndroidStudio_projects/.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="11" />
+  </component>
+</project>

AndroidStudio_projects/.idea/deploymentTargetDropDown.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetDropDown">
+    <targetSelectedWithDropDown>
+      <Target>
+        <type value="QUICK_BOOT_TARGET" />
+        <deviceKey>
+          <Key>
+            <type value="VIRTUAL_DEVICE_PATH" />
+            <value value="C:\Users\Lenovo\.android\avd\Pixel_XL_API_30.avd" />
+          </Key>
+        </deviceKey>
+      </Target>
+    </targetSelectedWithDropDown>
+    <timeTargetWasSelectedWithDropDown value="2022-10-25T13:49:43.646135700Z" />
+  </component>
+</project>

AndroidStudio_projects/.idea/gradle.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

AndroidStudio_projects/.idea/misc.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="Android Studio default JDK" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

AndroidStudio_projects/app/.gitignore

@@ -0,0 +1 @@
+/build

AndroidStudio_projects/app/.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

AndroidStudio_projects/app/.idea/gradle.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

AndroidStudio_projects/app/.idea/misc.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" project-jdk-name="Android Studio default JDK" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

AndroidStudio_projects/app/CMakeLists.txt

@@ -0,0 +1,44 @@
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.4.1)
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+
+add_library( # Sets the name of the library.
+             native-test
+
+             # Sets the library as a shared library.
+             SHARED
+
+             # Provides a relative path to your source file(s).
+             src/main/jni/native-test.c )
+
+# Searches for a specified prebuilt library and stores the path as a
+# variable. Because CMake includes system libraries in the search path by
+# default, you only need to specify the name of the public NDK library
+# you want to add. CMake verifies that the library exists before
+# completing its build.
+
+find_library( # Sets the name of the path variable.
+              log-lib
+
+              # Specifies the name of the NDK library that
+              # you want CMake to locate.
+              log )
+
+# Specifies libraries CMake should link to your target library. You
+# can link multiple libraries, such as libraries you define in this
+# build script, prebuilt third-party libraries, or system libraries.
+
+target_link_libraries( # Specifies the target library.
+                       native-test
+
+                       # Links the target library to the log library
+                       # included in the NDK.
+                       ${log-lib} )

AndroidStudio_projects/app/build.gradle

@@ -0,0 +1,75 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'com.example.hamburger'
+    compileSdk 32
+
+    defaultConfig {
+        applicationId "com.example.hamburger"
+        minSdk 21
+        targetSdk 32
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                cppFlags ""
+            }
+        }
+
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+
+
+
+
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'com.google.android.material:material:1.5.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
+    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.4.1'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.1'
+    implementation 'androidx.navigation:navigation-fragment:2.4.1'
+    implementation 'androidx.navigation:navigation-ui:2.4.1'
+    implementation files('libs\\mysql-connector-java-5.1.49.jar')
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+
+    implementation 'com.jakewharton:butterknife:10.0.0'
+    annotationProcessor 'com.jakewharton:butterknife-compiler:10.0.0'
+    //noinspection GradleCompatible
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    //noinspection GradleCompatible
+    //implementation 'com.android.support:recyclerview-v7:28.0.0'
+    implementation 'androidx.appcompat:appcompat:1.0.0'
+    //noinspection DuplicatePlatformClasses
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation files('libs/json-simple-1.1.jar')
+
+
+
+}

AndroidStudio_projects/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

AndroidStudio_projects/app/src/androidTest/java/com/example/hamburger/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.example.hamburger;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.example.hamburger", appContext.getPackageName());
+    }
+}

AndroidStudio_projects/app/src/debug/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

AndroidStudio_projects/app/src/debug/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

AndroidStudio_projects/app/src/debug/res/values/ic_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#0E3B53</color>
+</resources>

AndroidStudio_projects/app/src/main/AndroidManifest.xml

@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Hamburger"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity2"
+            android:exported="false"
+            android:label="@string/title_activity_main2">
+            <meta-data
+                android:name="android.app.lib_name"
+                android:value="" />
+        </activity>
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.app.lib_name"
+                android:value="" />
+        </activity>
+        <activity
+            android:name=".main_window"
+            android:exported="true" />
+        <activity
+            android:name=".register"
+            android:exported="true" />
+        <activity
+            android:name=".notifications"
+            android:exported="true" />
+        <activity android:name="com.example.dadac.testrosbridge.TransferSta"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity android:name="com.dadac.testrosbridge.RosBridgeActivity"/>
+    </application>
+
+</manifest>

AndroidStudio_projects/app/src/main/java/com/dadac/testrosbridge/RCApplication.java

@@ -0,0 +1,42 @@
+package com.dadac.testrosbridge;
+
+import android.app.Application;
+
+import com.jilk.ros.rosbridge.ROSBridgeClient;
+
+/**
+ * @ Create by dadac on 2018/10/8.
+ * @Function:
+ * @Return:
+ */
+public class RCApplication extends Application {
+
+
+    ROSBridgeClient client;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+    }
+
+    @Override
+    public void onTerminate() {
+        if (client != null)
+            client.disconnect();
+        super.onTerminate();
+
+    }
+
+    public ROSBridgeClient getRosClient() {
+        return client;
+    }
+
+    public void setRosClient(ROSBridgeClient client) {
+        this.client = client;
+    }
+
+
+}
+
+
+

AndroidStudio_projects/app/src/main/java/com/dadac/testrosbridge/RosBridgeActivity.java

@@ -0,0 +1,215 @@
+package com.dadac.testrosbridge;
+
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+
+import com.example.hamburger.R;
+import com.jilk.ros.ROSClient;
+import com.jilk.ros.rosbridge.ROSBridgeClient;
+import com.jilk.ros.rosbridge.implementation.PublishEvent;
+
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
+
+import de.greenrobot.event.EventBus;
+
+
+/**
+ * @ Create by dadac on 2018/10/8.
+ * @Function: 开始啪啦啪啦的进行数据的传输，需要放在service里面进行传输，比较保险，可以一直在传输数据
+ * @Return:
+ */
+public class RosBridgeActivity extends Activity implements View.OnClickListener {
+
+    ROSBridgeClient client;
+    String ip = "10.8.87.23";   //虚拟机的 IP
+    // String ip = "192.168.10.20";     //半残废机器人的IP
+    // String ip = "192.168.10.200";     //机器人的IP
+    String port = "9090";
+
+    boolean isSubscrible = true;
+    private static int flagSubscrible = 0;
+
+    private Button DC_Button_Subscrible;
+    private Button DC_Button_Publish;
+    private EditText DC_EditText_EnterWord;
+    private TextView DC_TextView_ShowData;
+
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.fragment_dashboard);
+        EventBus.getDefault().register(this);
+        onConnect(ip, port);
+        subMenuShow();
+    }
+
+    //初始化界面的参数
+    private void subMenuShow() {
+        DC_Button_Subscrible = (Button) findViewById(R.id.DC_Button_Subscrible);
+        DC_Button_Subscrible.setOnClickListener(this);
+        DC_Button_Publish = (Button) findViewById(R.id.DC_Button_Publish);
+        DC_Button_Publish.setOnTouchListener(new ComponentOnTouch());
+        DC_EditText_EnterWord = (EditText) findViewById(R.id.DC_EditText_EnterWord);
+        DC_TextView_ShowData = (TextView) findViewById(R.id.DC_TextView_ShowData);
+    }
+
+
+    /**
+     * @Function: 建立连接
+     * @Return:
+     */
+    public void onConnect(String ip, String port) {
+
+        client = new ROSBridgeClient("ws://" + ip + ":" + port);
+        boolean conneSucc = client.connect(new ROSClient.ConnectionStatusListener() {
+            @Override
+            public void onConnect() {
+                client.setDebug(true);
+                ((RCApplication) getApplication()).setRosClient(client);
+                showTip("Connect ROS success");
+                Log.d("dachen", "Connect ROS success");
+            }
+
+
+            @Override
+            public void onDisconnect(boolean normal, String reason, int code) {
+                showTip("ROS disconnect");
+                Log.d("dachen", "ROS disconnect");
+            }
+
+            @Override
+            public void onError(Exception ex) {
+                ex.printStackTrace();
+                showTip("ROS communication error");
+                Log.d("dachen", "ROS communication error");
+            }
+        });
+    }
+
+    //接收来自Ros端的数据
+    private void ReceiveDataToRos() {
+        if (isSubscrible == true) {
+            String msg1 = "{\"op\":\"subscribe\",\"topic\":\"/chatter\"}";
+            client.send(msg1);
+        } else if (isSubscrible == false) {
+            String msg2 = "{\"op\":\"unsubscribe\",\"topic\":\"/chatter\"}";
+            client.send(msg2);
+        }
+    }
+
+    //发送数据到ROS端
+    private void SendDataToRos(String data) {
+        String msg1 = "{ \"op\": \"publish\", \"topic\": \"/chatter\", \"msg\": { \"data\": \"" + data + " \" }}";
+        //        String msg2 = "{\"op\":\"publish\",\"topic\":\"/cmd_vel\",\"msg\":{\"linear\":{\"x\":" + 0 + ",\"y\":" +
+        //                0 + ",\"z\":0},\"angular\":{\"x\":0,\"y\":0,\"z\":" + 0.5 + "}}}";
+        client.send(msg1);
+    }
+
+
+    private void showTip(final String tip) {
+        runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                Toast.makeText(RosBridgeActivity.this, tip, Toast.LENGTH_SHORT).show();
+            }
+        });
+    }
+
+    public void onEvent(final PublishEvent event) {
+        if ("/chatter".equals(event.name)) {
+            parseChatterTopic(event);
+            return;
+        }
+        Log.d("dachen", event.msg);
+    }
+
+    private void parseChatterTopic(PublishEvent event) {
+        try {
+            JSONParser parser = new JSONParser();
+            org.json.simple.JSONObject jsonObject = (org.json.simple.JSONObject) parser.parse(event.msg);
+            String jsondata = (String) jsonObject.get("data");
+            DC_TextView_ShowData.setText(jsondata);
+            Log.i("dachen", jsondata);
+        } catch (ParseException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @SuppressLint("NonConstantResourceId")
+    @Override
+    public void onClick(View v) {
+        switch (v.getId()) {
+            case R.id.DC_Button_Subscrible:
+                if (flagSubscrible % 2 == 0) {
+                    isSubscrible = true;
+                    DC_Button_Subscrible.setText("Subscrible");
+                }
+                if (flagSubscrible % 2 == 1) {
+                    isSubscrible = false;
+                    DC_Button_Subscrible.setText("unSubscrible");
+                }
+                flagSubscrible++;
+                ReceiveDataToRos();
+                break;
+            default:
+                break;
+        }
+    }
+
+    private class ComponentOnTouch implements View.OnTouchListener {
+        @SuppressLint("NonConstantResourceId")
+        @Override
+        public boolean onTouch(View v, MotionEvent event) {
+            switch (v.getId()) {
+                case R.id.DC_Button_Publish:
+                    onTouchChange("up", event.getAction());
+                    break;
+                default:
+                    break;
+            }
+            return true;
+        }
+    }
+    private boolean Btn_LongPress = false;
+    class MyThread extends Thread {
+        @Override
+        public void run() {
+            while (Btn_LongPress) {
+                try {
+                    Thread.sleep(10);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+                SendDataToRos("3");
+            }
+        }
+    }
+    private void onTouchChange(String methodName, int eventAction) {
+        MyThread myThread = new MyThread();
+        // 按下松开分别对应启动停止线程方法
+        if ("up".equals(methodName)) {
+            if (eventAction == MotionEvent.ACTION_DOWN) {
+                myThread.start();
+                Btn_LongPress = true;
+            } else if (eventAction == MotionEvent.ACTION_UP) {
+                SendDataToRos("stop");
+                if (myThread != null)
+                    Btn_LongPress = false;
+            }
+        }
+    }
+
+}
+

AndroidStudio_projects/app/src/main/java/com/example/dadac/testrosbridge/JNICallAll.java

@@ -0,0 +1,23 @@
+package com.example.dadac.testrosbridge;
+
+/**
+ * @ Create by dadac on 2018/10/8.
+ * @Function:   存放所有的 JNI 调用的文件
+ * @Return:
+ */
+public class JNICallAll {
+
+    // Used to load the 'native-lib' library on application startup.
+    static {
+        System.loadLibrary("native-test");
+    }
+
+    /**
+     * A native method that is implemented by the 'native-lib' native library,
+     * which is packaged with this application.
+     */
+    public native String stringFromJNI();
+
+
+
+}

AndroidStudio_projects/app/src/main/java/com/example/dadac/testrosbridge/TransferSta.java

@@ -0,0 +1,29 @@
+package com.example.dadac.testrosbridge;
+
+import android.content.Intent;
+//import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+
+import com.dadac.testrosbridge.RosBridgeActivity;
+import com.example.hamburger.R;
+
+public class TransferSta extends AppCompatActivity {
+
+    private Button DC_Button_JumpToRos;
+
+   /* @Override
+    /*protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.fragment_dashboard);
+        DC_Button_JumpToRos = (Button) findViewById(R.id.DC_Button_JumpToRos);
+    }
+
+
+    public void JumpToActivity(View view) {
+        Intent myIntentRos = new Intent(TransferSta.this, RosBridgeActivity.class);
+        startActivity(myIntentRos);
+    }*/
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/MainActivity.java

@@ -0,0 +1,115 @@
+package com.example.hamburger;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.widget.EditText;
+import android.view.View;
+import android.widget.Toast;
+import android.widget.Button;
+import android.os.Handler;
+import android.os.Message;
+import android.annotation.SuppressLint;
+import com.example.hamburger.dao.UserDao;
+
+public class MainActivity extends AppCompatActivity {
+
+    //这个类主要用来进行，账号密码的验证，以及监听事件的编写。
+    // 所以首先需要将一开始设计的输入文本框id name 和passwd获取。
+    EditText name;//创建账号
+    EditText passwd;//创建密码
+
+    private static final String TAG="mysql-hamburger-MainActivity";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        name=findViewById(R.id.name);//获取输入的账号
+        passwd=findViewById(R.id.passwd);//获取输入的密码
+
+
+        //这是能够登录的账号密码
+        String Usename = "admin";
+        String Upwd = "12345";
+
+        //创建两个String类，储存从输入文本框获取到的内容
+        String user = name.getText().toString().trim();
+        String pwd = passwd.getText().toString().trim();
+
+        //获取按钮
+        Button button = (Button) findViewById(R.id.button);
+        Button button_1 = (Button) findViewById(R.id.register);
+
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick (View v){
+                //监听按钮，如果点击，就跳转
+                Intent intent = new Intent();
+                //前一个（MainActivity.this）是目前页面，后面一个是要跳转的下一个页面
+                intent.setClass(MainActivity.this, MainActivity2.class);
+                startActivity(intent);
+                //Toast.makeText(MainActivity.this, "欢迎你", Toast.LENGTH_SHORT).show();
+            }
+        });
+
+        /*//进行判断，如果两个内容都相等，就显现第一条语句，反之，第二条。
+        if(user.equals(Usename) & pwd.equals(Upwd)){
+            //按钮进行监听
+
+            }*/
+        //else{
+          //  Toast.makeText(MainActivity.this, "身份验证错误，禁止访问", Toast.LENGTH_SHORT).show();
+        //}
+        //按钮进行监听
+        button_1.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //监听按钮，如果点击，就跳转
+                Intent intent = new Intent();
+                //前一个（MainActivity.this）是目前页面，后面一个是要跳转的下一个页面
+                intent.setClass(MainActivity.this, register.class);
+                startActivity(intent);
+            }
+        });
+    }
+
+    public void login(View view){
+
+        EditText EditTextAccount = findViewById(R.id.name);
+        EditText EditTextPassword = findViewById(R.id.passwd);
+
+        new Thread(){
+            @Override
+            public void run() {
+                UserDao userDao = new UserDao();
+                int msg = userDao.login(EditTextAccount.getText().toString(),EditTextPassword.getText().toString());
+                hand1.sendEmptyMessage(msg);
+            }
+        }.start();
+
+    }
+
+    public void reg(View view){
+        startActivity(new Intent(getApplicationContext(),register.class));
+    }
+
+    @SuppressLint("HandlerLeak")
+    final Handler hand1 = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            if (msg.what == 0){
+                Toast.makeText(getApplicationContext(), "登录失败", Toast.LENGTH_LONG).show();
+            } else if (msg.what == 1) {
+                Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_LONG).show();
+            } else if (msg.what == 2){
+                Toast.makeText(getApplicationContext(), "密码错误", Toast.LENGTH_LONG).show();
+            } else if (msg.what == 3){
+                Toast.makeText(getApplicationContext(), "账号不存在", Toast.LENGTH_LONG).show();
+            }
+        }
+    };
+
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/MainActivity2.java

@@ -0,0 +1,37 @@
+package com.example.hamburger;
+
+import android.os.Bundle;
+
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.navigation.NavController;
+import androidx.navigation.Navigation;
+import androidx.navigation.ui.AppBarConfiguration;
+import androidx.navigation.ui.NavigationUI;
+
+import com.example.hamburger.databinding.ActivityMain2Binding;
+
+public class MainActivity2 extends AppCompatActivity {
+
+    private ActivityMain2Binding binding;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        binding = ActivityMain2Binding.inflate(getLayoutInflater());
+        setContentView(binding.getRoot());
+
+        BottomNavigationView navView = findViewById(R.id.nav_view);
+        // Passing each menu ID as a set of Ids because each
+        // menu should be considered as top level destinations.
+        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
+                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications)
+                .build();
+        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_activity_main2);
+        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
+        NavigationUI.setupWithNavController(binding.navView, navController);
+    }
+
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/add.java

@@ -0,0 +1,38 @@
+package com.example.hamburger;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+import com.example.hamburger.R;
+import com.example.hamburger.notifications;
+import com.example.hamburger.ui.notifications.NotificationsFragment;
+
+public class add extends AppCompatActivity {
+
+    EditText mytext;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_add);
+        mytext = findViewById(R.id.mt);
+
+    }
+
+    public void Confirm() {
+        Button button = (Button) findViewById(R.id.conf);
+
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent();
+                intent.setClass(add.this, NotificationsFragment.class);
+                startActivity(intent);
+            }
+        });
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/dao/UserDao.java

@@ -0,0 +1,165 @@
+package com.example.hamburger.dao;
+
+
+import com.example.hamburger.entity.User;
+import com.example.hamburger.utils.JDBCUtils;
+import android.util.Log;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.util.HashMap;
+
+/**
+ * author: yan
+ * date: 2022.02.17
+ * **/
+public class UserDao {
+
+    private static final String TAG = "mysql-party-UserDao";
+
+    /**
+     * function: 登录
+     * */
+    public int login(String userAccount, String userPassword){
+
+        HashMap<String, Object> map = new HashMap<>();
+        // 根据数据库名称，建立连接
+        Connection connection = JDBCUtils.getConn();
+        int msg = 0;
+        try {
+            // mysql简单的查询语句。这里是根据user表的userAccount字段来查询某条记录
+            String sql = "select * from user where userAccount = ?";
+            if (connection != null){// connection不为null表示与数据库建立了连接
+                PreparedStatement ps = connection.prepareStatement(sql);
+                if (ps != null){
+                    Log.e(TAG,"账号：" + userAccount);
+                    //根据账号进行查询
+                    ps.setString(1, userAccount);
+                    // 执行sql查询语句并返回结果集
+                    ResultSet rs = ps.executeQuery();
+                    int count = rs.getMetaData().getColumnCount();
+                    //将查到的内容储存在map里
+                    while (rs.next()){
+                        // 注意：下标是从1开始的
+                        for (int i = 1;i <= count;i++){
+                            String field = rs.getMetaData().getColumnName(i);
+                            map.put(field, rs.getString(field));
+                        }
+                    }
+                    connection.close();
+                    ps.close();
+
+                    if (map.size()!=0){
+                        StringBuilder s = new StringBuilder();
+                        //寻找密码是否匹配
+                        for (String key : map.keySet()){
+                            if(key.equals("userPassword")){
+                                if(userPassword.equals(map.get(key))){
+                                    msg = 1;            //密码正确
+                                }
+                                else
+                                    msg = 2;            //密码错误
+                                break;
+                            }
+                        }
+                    }else {
+                        Log.e(TAG, "查询结果为空");
+                        msg = 3;
+                    }
+                }else {
+                    msg = 0;
+                }
+            }else {
+                msg = 0;
+            }
+        }catch (Exception e){
+            e.printStackTrace();
+            Log.d(TAG, "异常login：" + e.getMessage());
+            msg = 0;
+        }
+        return msg;
+    }
+
+
+    /**
+     * function: 注册
+     * */
+    public boolean register(User user){
+        HashMap<String, Object> map = new HashMap<>();
+        // 根据数据库名称，建立连接
+        Connection connection = JDBCUtils.getConn();
+
+        try {
+            String sql = "insert into user(userAccount,userPassword,userName,userType,userState,userDel) values (?,?,?,?,?,?)";
+            if (connection != null){// connection不为null表示与数据库建立了连接
+                PreparedStatement ps = connection.prepareStatement(sql);
+                if (ps != null){
+
+                    //将数据插入数据库
+                    ps.setString(1,user.getUserAccount());
+                    ps.setString(2,user.getUserPassword());
+                    ps.setString(3,user.getUserName());
+                    ps.setInt(4,user.getUserType());
+                    ps.setInt(5, user.getUserState());
+                    ps.setInt(6,user.getUserDel());
+
+                    // 执行sql查询语句并返回结果集
+                    int rs = ps.executeUpdate();
+                    if(rs>0)
+                        return true;
+                    else
+                        return false;
+                }else {
+                    return  false;
+                }
+            }else {
+                return  false;
+            }
+        }catch (Exception e){
+            e.printStackTrace();
+            Log.e(TAG, "异常register：" + e.getMessage());
+            return false;
+        }
+
+    }
+
+    /**
+     * function: 根据账号进行查找该用户是否存在
+     * */
+    public User findUser(String userAccount) {
+
+        // 根据数据库名称，建立连接
+        Connection connection = JDBCUtils.getConn();
+        User user = null;
+        try {
+            String sql = "select * from user where userAccount = ?";
+            if (connection != null){// connection不为null表示与数据库建立了连接
+                PreparedStatement ps = connection.prepareStatement(sql);
+                if (ps != null) {
+                    ps.setString(1, userAccount);
+                    ResultSet rs = ps.executeQuery();
+
+                    while (rs.next()) {
+                        //注意：下标是从1开始
+                        int id = rs.getInt(1);
+                        String userAccount1 = rs.getString(2);
+                        String userPassword = rs.getString(3);
+                        String userName = rs.getString(4);
+                        int userType = rs.getInt(5);
+                        int userState = rs.getInt(6);
+                        int userDel = rs.getInt(7);
+                        user = new User(id, userAccount1, userPassword, userName, userType, userState, userDel);
+                    }
+                }
+            }
+        }catch (Exception e){
+            e.printStackTrace();
+            Log.d(TAG, "异常findUser：" + e.getMessage());
+            return null;
+        }
+        return user;
+    }
+
+}
+

AndroidStudio_projects/app/src/main/java/com/example/hamburger/entity/User.java

@@ -0,0 +1,83 @@
+package com.example.hamburger.entity;
+
+public class User {
+
+    private int id;
+    private String userAccount;
+    private String userPassword;
+    private String userName;
+    private int userType;
+    private int userState;
+    private int userDel;
+
+
+    public User() {
+    }
+
+    public User(int id, String userAccount, String userPassword, String userName, int userType, int userState, int userDel) {
+        this.id = id;
+        this.userAccount = userAccount;
+        this.userPassword = userPassword;
+        this.userName = userName;
+        this.userType = userType;
+        this.userState = userState;
+        this.userDel = userDel;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getUserAccount() {
+        return userAccount;
+    }
+
+    public void setUserAccount(String userAccount) {
+        this.userAccount = userAccount;
+    }
+
+    public String getUserPassword() {
+        return userPassword;
+    }
+
+    public void setUserPassword(String userPassword) {
+        this.userPassword = userPassword;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public void setUserName(String userName) {
+        this.userName = userName;
+    }
+
+    public int getUserType() {
+        return userType;
+    }
+
+    public void setUserType(int userType) {
+        this.userType = userType;
+    }
+
+    public int getUserState() {
+        return userState;
+    }
+
+    public void setUserState(int userState) {
+        this.userState = userState;
+    }
+
+    public int getUserDel() {
+        return userDel;
+    }
+
+    public void setUserDel(int userDel) {
+        this.userDel = userDel;
+    }
+}
+

AndroidStudio_projects/app/src/main/java/com/example/hamburger/main_window.java

@@ -0,0 +1,15 @@
+package com.example.hamburger;
+
+import android.os.Bundle;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class main_window extends AppCompatActivity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        //这个是获取布局文件的，这里是你下一个页面的布局文件//注意这个是跳转界面的不能设置错，应该是第一个
+        setContentView(R.layout.main_window);
+    }
+
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/notifications.java

@@ -0,0 +1,29 @@
+package com.example.hamburger;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+
+public class notifications extends AppCompatActivity {
+
+    private TextView tv;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.fragment_notifications);
+
+        Button button = (Button) findViewById(R.id.btn1);
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent();
+                intent.setClass(notifications.this, add.class);
+                startActivity(intent);
+            }
+        });
+    }
+
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/register.java

@@ -0,0 +1,65 @@
+package com.example.hamburger;
+
+import android.annotation.SuppressLint;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class register extends AppCompatActivity {
+
+    EditText name;//创建账号
+    EditText passwd;//创建密码
+    EditText ackpasswd;
+
+    @SuppressLint("MissingInflatedId")
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        //这个是获取布局文件的，这里是你下一个页面的布局文件//注意这个是跳转界面的不能设置错，应该是第一个
+        setContentView(R.layout.activity_register);
+
+        name=findViewById(R.id.user_name);//获取输入的账号
+        passwd=findViewById(R.id.new_passwd);//获取输入的密码
+        ackpasswd=findViewById(R.id.ack_passwd);
+    }
+
+    public void Register_(){
+        //获取按钮
+        Button button = (Button) findViewById(R.id.register_);
+
+        //按钮进行监听
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //监听按钮，如果点击，就跳转
+                Intent intent = new Intent();
+                //前一个（MainActivity.this）是目前页面，后面一个是要跳转的下一个页面
+                intent.setClass(register.this, MainActivity.class);
+                startActivity(intent);
+            }
+        });
+    }
+
+    public void Ret(){
+        //获取按钮
+        Button button = (Button) findViewById(R.id.ret);
+
+        //按钮进行监听
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //监听按钮，如果点击，就跳转
+                Intent intent = new Intent();
+                //前一个（MainActivity.this）是目前页面，后面一个是要跳转的下一个页面
+                intent.setClass(register.this, MainActivity.class);
+                startActivity(intent);
+            }
+        });
+    }
+
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/ui/dashboard/DashboardFragment.java

@@ -0,0 +1,37 @@
+package com.example.hamburger.ui.dashboard;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.ViewModelProvider;
+
+import com.example.hamburger.databinding.FragmentDashboardBinding;
+
+public class DashboardFragment extends Fragment {
+
+    private FragmentDashboardBinding binding;
+
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             ViewGroup container, Bundle savedInstanceState) {
+        DashboardViewModel dashboardViewModel =
+                new ViewModelProvider(this).get(DashboardViewModel.class);
+
+        binding = FragmentDashboardBinding.inflate(inflater, container, false);
+        View root = binding.getRoot();
+
+        final TextView textView = binding.v1;
+        dashboardViewModel.getText().observe(getViewLifecycleOwner(), textView::setText);
+        return root;
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/ui/dashboard/DashboardViewModel.java

@@ -0,0 +1,19 @@
+package com.example.hamburger.ui.dashboard;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+public class DashboardViewModel extends ViewModel {
+
+    private final MutableLiveData<String> mText;
+
+    public DashboardViewModel() {
+        mText = new MutableLiveData<>();
+        mText.setValue("");
+    }
+
+    public LiveData<String> getText() {
+        return mText;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/ui/home/HomeFragment.java

@@ -0,0 +1,37 @@
+package com.example.hamburger.ui.home;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.ViewModelProvider;
+
+import com.example.hamburger.databinding.FragmentHomeBinding;
+
+public class HomeFragment extends Fragment {
+
+    private FragmentHomeBinding binding;
+
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             ViewGroup container, Bundle savedInstanceState) {
+        HomeViewModel homeViewModel =
+                new ViewModelProvider(this).get(HomeViewModel.class);
+
+        binding = FragmentHomeBinding.inflate(inflater, container, false);
+        View root = binding.getRoot();
+
+        final TextView textView = binding.TextView1;
+        homeViewModel.getText().observe(getViewLifecycleOwner(), textView::setText);
+        return root;
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/ui/home/HomeViewModel.java

@@ -0,0 +1,19 @@
+package com.example.hamburger.ui.home;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+public class HomeViewModel extends ViewModel {
+
+    private final MutableLiveData<String> mText;
+
+    public HomeViewModel() {
+        mText = new MutableLiveData<>();
+        mText.setValue("This is home fragment");
+    }
+
+    public LiveData<String> getText() {
+        return mText;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/ui/notifications/NotificationsFragment.java

@@ -0,0 +1,57 @@
+package com.example.hamburger.ui.notifications;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.ViewModelProvider;
+
+import com.example.hamburger.R;
+import com.example.hamburger.databinding.FragmentNotificationsBinding;
+
+public class NotificationsFragment extends Fragment{
+
+    private FragmentNotificationsBinding binding;
+
+    private NotificationsViewModel notificationsViewModel;
+
+    private TextView tv;
+
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             ViewGroup container, Bundle savedInstanceState) {
+        NotificationsViewModel notificationsViewModel =
+                new ViewModelProvider(this).get(NotificationsViewModel.class);
+
+        binding = FragmentNotificationsBinding.inflate(inflater, container, false);
+        View root = binding.getRoot();
+
+        final TextView textView = binding.textNotifications;
+        notificationsViewModel.getText().observe(getViewLifecycleOwner(), textView::setText);
+
+        final Button button=root.findViewById(R.id.btn1);
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent();
+                intent.setClass(getActivity(), add.class);
+                startActivity(intent);
+            }
+        });
+
+        return root;
+
+    }
+
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/ui/notifications/NotificationsViewModel.java

@@ -0,0 +1,19 @@
+package com.example.hamburger.ui.notifications;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+public class NotificationsViewModel extends ViewModel {
+
+    private final MutableLiveData<String> mText;
+
+    public NotificationsViewModel() {
+        mText = new MutableLiveData<>();
+        mText.setValue("This is notifications fragment");
+    }
+
+    public LiveData<String> getText() {
+        return mText;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/ui/notifications/add.java

@@ -0,0 +1,37 @@
+package com.example.hamburger.ui.notifications;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+import com.example.hamburger.R;
+import com.example.hamburger.notifications;
+
+public class add extends AppCompatActivity {
+
+    EditText mytext;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_add);
+        mytext = findViewById(R.id.mt);
+
+    }
+
+    public void Confirm() {
+        Button button = (Button) findViewById(R.id.conf);
+
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent();
+                intent.setClass(add.this, NotificationsFragment.class);
+                startActivity(intent);
+            }
+        });
+    }
+}

AndroidStudio_projects/app/src/main/java/com/example/hamburger/utils/JDBCUtils.java

@@ -0,0 +1,37 @@
+package com.example.hamburger.utils;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+
+/**
+ * function： 数据库工具类，连接数据库用
+ */
+public class JDBCUtils {
+    private static final String TAG = "mysql-party-JDBCUtils";
+
+    private static String driver = "com.mysql.jdbc.Driver";// MySql驱动
+
+    private static String dbName = "Hotel_system";// 数据库名称
+
+    private static String user = "root";// 用户名
+
+    private static String password = "123456";// 密码
+
+    public static Connection getConn(){
+
+        Connection connection = null;
+        try{
+            Class.forName(driver);// 动态加载类
+            String ip = "10.0.2.2";// 写成本机地址，不能写成localhost，同时手机和电脑连接的网络必须是同一个
+
+            // 尝试建立到给定数据库URL的连接
+            connection = DriverManager.getConnection("jdbc:mysql://" + ip + ":3306/" + dbName,
+                    user, password);
+
+        }catch (Exception e){
+            e.printStackTrace();
+        }
+        return connection;
+    }
+}
+

AndroidStudio_projects/app/src/main/java/com/jilk/ros/Example.java

@@ -0,0 +1,139 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros;
+
+import com.jilk.ros.message.Clock;
+import com.jilk.ros.message.Log;
+import com.jilk.ros.rosapi.message.Empty;
+import com.jilk.ros.rosapi.message.GetTime;
+import com.jilk.ros.rosapi.message.MessageDetails;
+import com.jilk.ros.rosapi.message.Type;
+import com.jilk.ros.rosbridge.ROSBridgeClient;
+
+public class Example {
+    
+    public Example() {}
+    
+    public static void main(String[] args) {
+        ROSBridgeClient client = new ROSBridgeClient("ws://10.8.87.23:9090");
+        client.connect();
+        //testTopic(client);
+        try {
+        testService(client);
+        }
+        catch (RuntimeException ex) {
+            ex.printStackTrace();
+        }
+        finally {
+            client.disconnect();
+        }
+    }            
+    
+    public static void testService(ROSBridgeClient client) {
+        try {
+            Service<Empty, GetTime> timeService =
+                    new Service<Empty, GetTime>("/rosapi/get_time", Empty.class, GetTime.class, client);
+            timeService.verify();
+            //System.out.println("Time (secs): " + timeService.callBlocking(new Empty()).time.sec);
+            
+            Service<com.jilk.ros.rosapi.message.Service, Type> serviceTypeService =
+                    new Service<com.jilk.ros.rosapi.message.Service, Type>("/rosapi/service_type",
+                        com.jilk.ros.rosapi.message.Service.class, Type.class, client);
+            serviceTypeService.verify();
+            String type = serviceTypeService.callBlocking(new com.jilk.ros.rosapi.message.Service("/rosapi/service_response_details")).type;
+            
+            Service<Type, MessageDetails> serviceDetails =
+                    new Service<Type, MessageDetails>("/rosapi/service_response_details",
+                        Type.class, MessageDetails.class, client);
+            serviceDetails.verify();
+            //serviceDetails.callBlocking(new Type(type)).print();
+            
+            com.jilk.ros.Topic<Log> logTopic =
+                    new com.jilk.ros.Topic<Log>("/rosout", Log.class, client);
+            logTopic.verify();
+            
+            /*
+            System.out.println("Nodes");
+            for (String s : client.getNodes())
+                System.out.println("    " + s);
+            System.out.println("Topics");
+            for (String s : client.getTopics()) {
+                System.out.println(s + ":");
+                client.getTopicMessageDetails(s).print();
+            }
+            System.out.println("Services");
+            for (String s : client.getServices()) {
+                System.out.println(s + ":");
+                client.getServiceRequestDetails(s).print();
+                System.out.println("-----------------");
+                client.getServiceResponseDetails(s).print();
+            }
+            */
+        }
+        catch (InterruptedException ex) {
+            System.out.println("Process was interrupted.");
+        }
+        /*
+        Service<Empty, Topics> topicService =
+                new Service<Empty, Topics>("/rosapi/topics", Empty.class, Topics.class, client);
+        Service<Topic, Type> typeService =
+                new Service<Topic, Type>("/rosapi/topic_type", Topic.class, Type.class, client);
+        Service<Type, MessageDetails> messageService =
+                new Service<Type, MessageDetails>("/rosapi/message_details", Type.class, MessageDetails.class, client);
+        try {
+            Topics topics = topicService.callBlocking(new Empty());
+            for (String topicString : topics.topics) {
+                Topic topic = new Topic();
+                topic.topic = topicString;
+                Type type = typeService.callBlocking(topic);
+                MessageDetails details = messageService.callBlocking(type);
+                System.out.println("Topic: " + topic.topic + " Type: " + type.type);
+                details.print();
+                System.out.println();
+            }
+            Type type = new Type();
+            type.type = "time";
+            System.out.print("Single type check on \'time\': ");
+            messageService.callBlocking(type).print();
+        }
+        catch (InterruptedException ex) {
+            System.out.println("testService: process was interrupted.");
+        }
+        */
+    }
+    
+    public static void testTopic(ROSBridgeClient client) {
+        com.jilk.ros.Topic<Clock> clockTopic = new com.jilk.ros.Topic<Clock>("/clock", Clock.class, client);
+        clockTopic.subscribe();
+        try {
+            Thread.sleep(20000);} catch(InterruptedException ex) {}
+        Clock cl = null;
+        try {
+            cl = clockTopic.take(); // just gets one
+        }
+        catch (InterruptedException ex) {}
+        cl.print();
+        cl.clock.nsecs++;
+        clockTopic.unsubscribe();
+        clockTopic.advertise();
+        clockTopic.publish(cl);
+        clockTopic.unadvertise();
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/MessageHandler.java

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros;
+
+import com.jilk.ros.message.Message;
+
+public interface MessageHandler<T extends Message> {
+    public void onMessage(T message);
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/ROSClient.java

@@ -0,0 +1,68 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.rosapi.message.TypeDef;
+import com.jilk.ros.rosbridge.FullMessageHandler;
+import com.jilk.ros.rosbridge.ROSBridgeClient;
+import com.jilk.ros.rosbridge.operation.Operation;
+
+public abstract class ROSClient {
+
+    public ROSClient() {}
+    
+    public static ROSClient create(String uriString) {
+        // if we ever implement other ROSClient types, we'll key off the URI protocol (e.g., ws://)
+        // we'd also have to abstract out Topic and Service since they depend on the ROSBridge operations
+        return new ROSBridgeClient(uriString);
+    }
+    
+    public abstract boolean connect();
+    public abstract boolean connect(ConnectionStatusListener listener);
+    public abstract void disconnect();
+    public abstract void send(Operation operation);
+    public abstract void send(String json);
+    public abstract void register(Class<? extends Operation> c,
+            String s,
+            Class<? extends Message> m,
+            FullMessageHandler h);
+    public abstract void unregister(Class<? extends Operation> c, String s);
+    public abstract void setDebug(boolean debug);
+    public abstract String[] getNodes() throws InterruptedException;
+    public abstract String[] getTopics() throws InterruptedException;
+    public abstract String[] getServices() throws InterruptedException;
+    public abstract TypeDef getTopicMessageDetails(String topic) throws InterruptedException;
+    public abstract TypeDef[] getTopicMessageList(String topic) throws InterruptedException;
+    public abstract TypeDef getServiceRequestDetails(String service) throws InterruptedException;
+    public abstract TypeDef[] getServiceRequestList(String service) throws InterruptedException;
+    public abstract TypeDef getServiceResponseDetails(String service) throws InterruptedException;
+    public abstract TypeDef[] getServiceResponseList(String service) throws InterruptedException;
+    public abstract TypeDef getTypeDetails(String type) throws InterruptedException;
+    public abstract TypeDef[] getTypeList(String type) throws InterruptedException;
+    public abstract void typeMatch(TypeDef t, Class<? extends Message> c) throws InterruptedException; 
+    public abstract Object getUnderlyingClient(); // for debugging
+    
+    public interface ConnectionStatusListener {
+        public void onConnect();
+        public void onDisconnect(boolean normal, String reason, int code);
+        public void onError(Exception ex);
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/Service.java

@@ -0,0 +1,134 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.rosbridge.FullMessageHandler;
+import com.jilk.ros.rosbridge.operation.CallService;
+import com.jilk.ros.rosbridge.operation.ServiceResponse;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.CountDownLatch;
+
+public class Service<CallType extends Message, ResponseType extends Message> extends Message implements FullMessageHandler {
+    private String service;
+    private Class<? extends ResponseType> responseType;
+    private Class<? extends CallType> callType;
+    private ROSClient client;
+    private Map<String, CallRecord> calls;
+    
+    public Service(String service, Class<? extends CallType> callType,
+                   Class<? extends ResponseType> responseType, ROSClient client) {
+        this.service = service;
+        this.client = client;
+        this.responseType = responseType;
+        this.callType = callType;
+        calls = new HashMap<String, CallRecord>();
+    }
+
+    // A result can only be returned once; it is cleared from the hash before 
+    //   being sent/returned. This is to ensure that results do not accumulate
+    //   indefinitely.  If callers need to keep these around they can set up their 
+    //   own hash.
+    
+    @Override
+    public void onMessage(String id, Message response) {
+        //System.out.print("Service.onMessage: ");
+        //response.print();
+        CallRecord call = calls.get(id);
+        if(call == null) {
+            System.out.print("No caller service response");
+            return;
+        }
+        if (call.handler != null) {
+            calls.remove(id);
+            call.handler.onMessage((ResponseType) response);
+        }
+        else {
+            call.result = (ResponseType) response;
+            call.latch.countDown();
+        }
+    }
+    
+    public String call(CallType args) {
+        return callImpl(args, null);
+    }
+    
+    public void callWithHandler(CallType args, MessageHandler<ResponseType> responseHandler) {
+        callImpl(args, responseHandler);
+    }
+    
+    public ResponseType callBlocking(CallType args) throws InterruptedException {
+        return take(call(args));
+    }
+    
+    private String callImpl(CallType args, MessageHandler<ResponseType> responseHandler) {
+        client.register(ServiceResponse.class, service, responseType, this);  // do this once on creation?
+        CallService messageCallService = new CallService(service, args);
+        String id = messageCallService.id;
+        CallRecord callRecord = new CallRecord(responseHandler);
+        calls.put(id, callRecord);
+        client.send(messageCallService);
+        return id;
+    }
+    
+    public ResponseType poll(String id) {
+        CallRecord call = calls.get(id);
+        if (call.result != null)
+            calls.remove(id);
+        return call.result;
+    }
+    
+    public ResponseType take(String id) throws InterruptedException {
+        CallRecord call = calls.get(id);
+        call.latch.await();
+        calls.remove(id);
+        return call.result;
+    }
+    
+    public void verify() throws InterruptedException {
+
+        boolean hasService = false;
+        for (String s : client.getServices()) {
+            if (s.equals(service)) {
+                hasService = true;
+                break;
+            }
+        }
+        if (!hasService)
+            throw new RuntimeException("Service \'" + service + "\' not available.");
+        
+        client.typeMatch(client.getServiceRequestDetails(service), callType);
+        client.typeMatch(client.getServiceResponseDetails(service), responseType);
+    }
+    
+    private class CallRecord {
+        public ResponseType result;
+        public CountDownLatch latch;
+        public MessageHandler<ResponseType> handler;
+        
+        public CallRecord(MessageHandler<ResponseType> handler) {
+            this.result = null;
+            this.latch = new CountDownLatch(1);
+            this.handler = handler;
+        }
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/Topic.java

@@ -0,0 +1,144 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.rosbridge.FullMessageHandler;
+import com.jilk.ros.rosbridge.operation.Advertise;
+import com.jilk.ros.rosbridge.operation.Operation;
+import com.jilk.ros.rosbridge.operation.Publish;
+import com.jilk.ros.rosbridge.operation.Subscribe;
+import com.jilk.ros.rosbridge.operation.Unadvertise;
+import com.jilk.ros.rosbridge.operation.Unsubscribe;
+
+import java.util.concurrent.LinkedBlockingQueue;
+
+
+public class Topic<T extends Message> extends LinkedBlockingQueue<T> implements FullMessageHandler {
+    protected String topic;
+    private Class<? extends T> type;
+    private String messageType;
+    private ROSClient client;
+    private Thread handlerThread;
+    
+    public Topic(String topic, Class<? extends T> type, ROSClient client) {
+        this.topic = topic;
+        this.client = client;
+        this.type = type;
+        messageType = Message.getMessageType(type);
+        handlerThread = null;
+    }
+    
+    @Override
+    public void onMessage(String id, Message message) {
+        add((T) message);
+    }
+    
+    
+    // warning: there is a delay between the completion of this method and 
+    //          the completion of the subscription; it takes longer than
+    //          publishing multiple other messages, for example.    
+    public void subscribe(MessageHandler<T> handler) {
+        startRunner(handler);
+        subscribe();
+    }
+    
+    public void subscribe() {
+        client.register(Publish.class, topic, type, this);
+        send(new Subscribe(topic, messageType));
+    }
+    
+    public void unsubscribe() {
+        // need to handle race conditions in incoming message handler
+        //    so that once unsubscribe has happened the handler gets no more
+        //    messages
+        send(new Unsubscribe(topic));        
+        client.unregister(Publish.class, topic);
+        stopRunner();
+    }
+    
+    private void startRunner(MessageHandler<T> handler) {
+        stopRunner();
+        handlerThread = new Thread(new MessageRunner(handler));
+        handlerThread.setName("Message handler for " + topic);
+        handlerThread.start();
+    }
+    
+    private void stopRunner() {
+        if (handlerThread != null) {
+            handlerThread.interrupt();
+            clear();
+            handlerThread = null;
+        }
+    }
+    
+    
+    public void advertise() {
+        send(new Advertise(topic, messageType));
+    }
+    
+    public void publish(T message) {
+        send(new Publish(topic, message));
+    }
+    
+    public void unadvertise() {
+        send(new Unadvertise(topic));
+    }
+    
+    private void send(Operation operation) {
+        client.send(operation);
+    }
+    
+    public void verify() throws InterruptedException {
+
+        boolean hasTopic = false;
+        for (String s : client.getTopics()) {
+            if (s.equals(topic)) {
+                hasTopic = true;
+                break;
+            }
+        }
+        if (!hasTopic)
+            throw new RuntimeException("Topic \'" + topic + "\' not available.");
+        
+        client.typeMatch(client.getTopicMessageDetails(topic), type);
+    }
+    
+    private class MessageRunner implements Runnable {
+        private MessageHandler<T> handler;
+
+        public MessageRunner(MessageHandler<T> handler) {
+            this.handler = handler;
+        }             
+        
+        @Override
+        public void run() {
+            while (!Thread.interrupted()) {
+                try {
+                    handler.onMessage(take());
+                }
+                catch (InterruptedException ex) {
+                    break;
+                }
+            }
+        }
+    }
+    
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/AudioMsg.java

@@ -0,0 +1,9 @@
+package com.jilk.ros.message;
+
+/**
+ * Created by xxhong on 16-11-17.
+ */
+@MessageType(string = "std_msgs/Int16MultiArray")
+public class AudioMsg extends Message {
+    public short[] data;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/Clock.java

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "rosgraph_msgs/Clock")
+public class Clock extends Message {
+    public TimePrimitive clock;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/Duration.java

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "std_msgs/Duration")
+public class Duration extends DurationPrimitive {
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/DurationPrimitive.java

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "duration")
+public class DurationPrimitive extends TimePrimitive {
+
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/Empty.java

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "std_srvs/Empty")
+public class Empty extends Message {
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/Header.java

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "std_msgs/Header")
+public class Header extends Message {
+    public long seq;
+    public TimePrimitive stamp;
+    public String frame_id;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/Log.java

@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "rosgraph_msgs/Log")
+public class Log extends Message {
+    public Header header;
+    public byte level;
+    public String name;
+    public String msg;
+    public String file;
+    public String function;
+    public long line;
+    public String[] topics;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/Message.java

@@ -0,0 +1,202 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.Field;
+import java.util.Map;
+
+
+@MessageType(string = "message")
+public abstract class Message {
+    
+    // Some requirements about message types:
+    //   - It must have a MessageType declaration to be recognized on inbound messages
+    //   - Every field must be explicitly designated as public
+    //   - Every field that is not a primitive or near-primitive must be another Message class
+    //   - If there is a non-empty constructor, you must also have an empty constructor
+    //   - If it is set up as an inner class, it needs an explicit nullary constructor
+    //     (note: I have seen an inner class otherwise fail, I have not tested it with the explicit constructor)
+    
+    public static void register(Class c, Map<String, Class> messageClasses) {
+        try {
+            typecheck(c);
+
+            // Must register the class and not have duplicate
+            // This is not recursive because only the top level message class
+            //   needs to be determined from the string - others are top-down.
+            String messageString = getMessageType(c);
+            Class existingClass = messageClasses.get(messageString);
+            if (existingClass != null && !existingClass.equals(c))
+                throw new MessageException("Message String \'" + messageString +
+                    "\' is assigned to two different classes (" +
+                        c.getName() + " and " + existingClass.getName() + ")");
+            messageClasses.put(messageString, c);        
+        }
+        catch (MessageException ex) {
+            // should be changed to be a hooked method to give library user control
+            System.out.println(ex.getMessage());
+        }
+    }
+    
+    public static String getMessageType(Class c) {
+        return ((MessageType) c.getAnnotation(MessageType.class)).string();
+    }    
+    
+    // this has never been used or tested but kind of belongs here
+    // commented out because it uses ReflectiveOperationException which is not available on Android
+    /*
+    public static Message newInstance(String className) {
+        try {
+            Class messageClass = Class.forName(className);
+            if (Message.class.isAssignableFrom(messageClass))
+                return (Message) messageClass.newInstance();
+            else throw new ClassCastException();
+        }
+        catch (ReflectiveOperationException ex) {
+            throw new RuntimeException("Unable to create message of class \'" + className + "\'.", ex);
+        }
+    }
+    */
+    
+    // Could probably do more checking here, but not sure what right now
+    private static void typecheck(Class c) throws MessageException {
+        
+        // Must inherit from Message
+        if (!Message.class.isAssignableFrom(c))
+            throw new MessageException("Class \'" + c.getName() +
+                    "\' does not extend Message");
+
+        // Must have the MessageType annotation
+        if (getMessageType(c) == null)
+            throw new MessageException("Class \'" + c.getName() +
+                    "\' is missing the MessageType annotation");
+                
+        // All fields must also be valid Message classes
+        // Note that this also serves to force-load all the message classes
+        //      so that they get registered
+        for (Field f : c.getFields()) {
+            Class fc = f.getType();
+            if (fc.isArray()) {
+                Class ac = fc.getComponentType();
+                if (!isPrimitive(ac))
+                    typecheck(ac);
+            }
+            else if (!isPrimitive(fc))
+                typecheck(fc);
+        }
+    }
+    
+    public void print() {
+        printMessage(this, "");
+    }
+    
+    private static void printMessage(Object o, String indent) {
+        for (Field f : o.getClass().getFields()) {
+            Class c = f.getType();
+            Object fieldObject = getFieldObject(f, o);
+            if (fieldObject != null) {
+                if (isPrimitive(c))
+                    System.out.println(indent + f.getName() + ": " + fieldObject);
+                else if (c.isArray()) {
+                    System.out.println(indent + f.getName() + ": [");
+                    printArray(fieldObject, indent + "  ");
+                    System.out.println(indent + "]");
+                }
+                else {
+                    System.out.println(indent + f.getName() + ":");
+                    printMessage(fieldObject, indent + "  ");
+                }
+            }
+        }
+    }
+    
+    private static void printArray(Object array, String indent) {
+        Class arrayClass = array.getClass().getComponentType();
+        for (int i = 0; i < Array.getLength(array); i++) {
+            Object elementObject = Array.get(array, i);
+            if (elementObject != null) {
+                if (isPrimitive(arrayClass))
+                    System.out.println(indent + i + ": " + elementObject);
+                else if (arrayClass.isArray()) { // this is not actually allowed in ROS
+                    System.out.println(indent + i + ": [");
+                    printArray(elementObject, indent + "  ");
+                    System.out.println(indent + "]");
+                }
+                else {
+                    System.out.println(indent + i + ":");
+                    printMessage(elementObject, indent + "  ");
+                }
+            }
+        }
+        // remember to print array indices
+    }
+    
+    public static boolean isPrimitive(Class c) {
+        return (c.isPrimitive() ||
+                c.equals(String.class) ||
+                Number.class.isAssignableFrom(c) ||
+                c.equals(Boolean.class));
+    }    
+    
+
+    // Copied from com.jilk.ros.rosbridge.JSON
+    private static Object getFieldObject(Field f, Object o) {
+        Object fo = null;
+        try {
+            fo = f.get(o);
+        }
+        catch (IllegalAccessException ex) {
+            ex.printStackTrace();
+        }
+        return fo;
+    }
+    
+    public void copyFrom(Message source) {
+        try {
+            if (source.getClass() != getClass())
+                throw new RuntimeException("Attempt to copy non-matching classes");
+            for (Field f : getClass().getFields()) {
+                Class fc = f.getType();
+                if (fc.isArray())
+                    throw new RuntimeException("copyFrom - array types not implemented");
+                else if (!isPrimitive(fc))
+                    ((Message) f.get(this)).copyFrom((Message) f.get(source));
+                else {
+                    Object value = f.get(source);
+                    f.set(this, value);
+                }
+            }
+        }
+        catch (IllegalAccessException ex) {
+            throw new RuntimeException("copyFrom error", ex);
+        }
+        catch (ClassCastException ex) {
+            throw new RuntimeException("copyFrom error", ex);
+        }
+        // ReflectiveOperationException is not available on Android (Java 1.6)
+        /*
+        catch (ReflectiveOperationException ex) {
+            throw new RuntimeException ("copyFrom error", ex);
+        }
+        */
+    }
+    
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/MessageException.java

@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+public class MessageException extends Exception {
+
+    public MessageException(String message) {
+        super(message);
+    }
+    
+    public MessageException(String message, Throwable cause) {
+        super(message, cause);
+    }    
+}
+

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/MessageType.java

@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface MessageType {
+    String string() default "";
+}
+

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/SemanticRequest.java

@@ -0,0 +1,13 @@
+package com.jilk.ros.message;
+
+/**
+ * Created by xxhong on 16-11-17.
+ */
+@MessageType(string = "std_msgs/String")
+public class SemanticRequest extends Message {
+    public  SemanticRequest(String args) {
+        jsonStr = args;
+    }
+
+    public String jsonStr;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/SemanticResponse.java

@@ -0,0 +1,9 @@
+package com.jilk.ros.message;
+
+/**
+ * Created by xxhong on 16-11-17.
+ */
+@MessageType(string = "std_msgs/String")
+public class SemanticResponse extends Message {
+    public String result;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/StdMsg.java

@@ -0,0 +1,9 @@
+package com.jilk.ros.message;
+
+/**
+ * Created by xxhong on 16-11-17.
+ */
+@MessageType(string = "std_msgs/String")
+public class StdMsg extends Message {
+    public String data;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/Time.java

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "std_msgs/Time")
+public class Time extends TimePrimitive {
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/message/TimePrimitive.java

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.message;
+
+@MessageType(string = "time")
+public class TimePrimitive extends Message {
+    public int secs;  // when requesting this format from ROSbridge, it uses 'sec' (no 's')
+    public int nsecs; // when requesting this format from ROSbridge, it uses 'nsec'
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/Empty.java

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "std_msgs/Empty")
+public class Empty extends Message {
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/GetTime.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+import com.jilk.ros.message.TimePrimitive;
+
+
+@MessageType(string = "rosapi/GetTimeResponse")
+public class GetTime extends Message {
+    public TimePrimitive time;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/MessageDetails.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/MessageDetails")
+public class MessageDetails extends Message {
+    public TypeDef[] typedefs;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/Nodes.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/Nodes")
+public class Nodes extends Message {
+    public String[] nodes;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/Service.java

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/Service")
+public class Service extends Message {
+    public String service;
+    
+    public Service() {}
+    
+    public Service(String service) {
+        this.service = service;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/Services.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/Services")
+public class Services extends Message {
+    public String[] services;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/Topic.java

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/Topic")
+public class Topic extends Message {
+    public String topic;
+    
+    public Topic() {}
+    
+    public Topic(String topic) {
+        this.topic = topic;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/Topics.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/Topics")
+public class Topics extends Message {
+    public String[] topics;
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/Type.java

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/Type")
+public class Type extends Message {
+    public String type;
+    
+    public Type() {}
+    
+    public Type(String type) {
+        this.type = type;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosapi/message/TypeDef.java

@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosapi.message;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+
+@MessageType(string = "rosapi/TypeDef")
+public class TypeDef extends Message {
+    public String type;
+    public String[] fieldnames;
+    public String[] fieldtypes;
+    public int[] fieldarraylen;
+    public String[] examples;
+    
+    public static boolean match(String type, Class c) {
+        boolean result = false;
+        if (
+            (type.equals("bool")    && ((boolean.class.equals(c)) || (Boolean.class.equals(c)))) ||
+            (type.equals("int8")    && ((byte.class.equals(c))    || (Byte.class.equals(c)))) ||
+            (type.equals("byte")    && ((byte.class.equals(c))    || (Byte.class.equals(c)))) ||            // deprecated
+            (type.equals("uint8")   && ((short.class.equals(c))   || (Short.class.equals(c)))) ||
+            (type.equals("char")    && ((short.class.equals(c))   || (Short.class.equals(c)))) ||           // deprecated
+            (type.equals("int16")   && ((short.class.equals(c))   || (Short.class.equals(c)))) ||
+            (type.equals("uint16")  && ((int.class.equals(c))     || (Integer.class.equals(c)))) ||
+            (type.equals("int32")   && ((int.class.equals(c))     || (Integer.class.equals(c)))) ||
+            (type.equals("uint32")  && ((long.class.equals(c))    || (Long.class.equals(c)))) ||
+            (type.equals("int64")   && ((long.class.equals(c))    || (Long.class.equals(c)))) ||
+            (type.equals("float32") && ((float.class.equals(c))   || (Float.class.equals(c)))) ||
+            (type.equals("float64") && ((double.class.equals(c))  || (Double.class.equals(c)))) ||
+            (type.equals("uint64")  &&                               (java.math.BigInteger.class.equals(c))) ||
+            (type.equals("string")  &&                               (String.class.equals(c)))
+        )
+                result = true;
+            
+        return result;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/FullMessageHandler.java

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge;
+
+import com.jilk.ros.message.Message;
+
+public interface FullMessageHandler<T extends Message> {
+    public void onMessage(String id, T message);
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/ROSBridgeClient.java

@@ -0,0 +1,260 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge;
+
+import com.jilk.ros.ROSClient;
+import com.jilk.ros.Service;
+import com.jilk.ros.message.Message;
+import com.jilk.ros.message.MessageType;
+import com.jilk.ros.rosapi.message.Empty;
+import com.jilk.ros.rosapi.message.MessageDetails;
+import com.jilk.ros.rosapi.message.Nodes;
+import com.jilk.ros.rosapi.message.Services;
+import com.jilk.ros.rosapi.message.Topic;
+import com.jilk.ros.rosapi.message.Topics;
+import com.jilk.ros.rosapi.message.Type;
+import com.jilk.ros.rosapi.message.TypeDef;
+import com.jilk.ros.rosbridge.implementation.ROSBridgeWebSocketClient;
+import com.jilk.ros.rosbridge.operation.Operation;
+
+import java.lang.reflect.Field;
+
+public class ROSBridgeClient extends ROSClient {
+    String uriString;
+    ROSBridgeWebSocketClient client;
+    
+    public ROSBridgeClient(String uriString) {
+        this.uriString = uriString;
+    }
+    
+    @Override
+    public boolean connect() {
+        return connect(null);
+    }
+    
+    @Override
+    public boolean connect(ROSClient.ConnectionStatusListener listener) {
+        boolean result = false;
+        client = ROSBridgeWebSocketClient.create(uriString);
+        if (client != null) {
+            client.setListener(listener);
+            try {
+                result = client.connectBlocking();
+            }
+            catch (InterruptedException ex) {}
+        }
+        return result;
+    }
+
+    @Override
+    public void disconnect() {
+        try {
+            client.closeBlocking();
+        }
+        catch (InterruptedException ex) {}
+    }
+
+    @Override
+    public void send(Operation operation) {
+        client.send(operation);
+    }
+
+    @Override
+    public void send(String json) {
+        client.send(json);
+    }
+
+    @Override
+    public void register(Class<? extends Operation> c,
+            String s,
+            Class<? extends Message> m,
+            FullMessageHandler h) {
+        client.register(c, s, m, h);
+    }
+
+    @Override
+    public void unregister(Class<? extends Operation> c, String s) {
+        client.unregister(c, s);
+    }
+
+    @Override
+    public void setDebug(boolean debug) {
+        client.setDebug(debug);
+    }
+
+    @Override
+    public String[] getNodes() throws InterruptedException {
+        Service<Empty, Nodes> nodeService =
+                new Service<Empty, Nodes>("/rosapi/nodes", Empty.class, Nodes.class, this);
+        return nodeService.callBlocking(new Empty()).nodes;
+    }
+
+    @Override
+    public String[] getTopics() throws InterruptedException {
+        Service<Empty, Topics> topicsService =
+                new Service<Empty, Topics>("/rosapi/topics", Empty.class, Topics.class, this);
+        return topicsService.callBlocking(new Empty()).topics;
+    }
+
+    @Override
+    public String[] getServices() throws InterruptedException {
+        Service<Empty, Services> servicesService =
+                new Service<Empty, Services>("/rosapi/services", Empty.class, Services.class, this);
+        return servicesService.callBlocking(new Empty()).services;
+    }
+
+    @Override
+    public TypeDef getTopicMessageDetails(String topic) throws InterruptedException {
+        return getTypeDetails(getTopicType(topic));
+    }
+
+    @Override
+    public TypeDef[] getTopicMessageList(String topic) throws InterruptedException {
+        return getTypeList(getTopicType(topic));
+    }
+
+    @Override
+    public TypeDef getServiceRequestDetails(String service) throws InterruptedException {
+        return getTypeDetails(getServiceType(service), "Request", "/rosapi/service_request_details");
+    }
+
+    @Override
+    public TypeDef[] getServiceRequestList(String service) throws InterruptedException {
+        return getTypeList(getServiceType(service), "Request", "/rosapi/service_request_details");
+    }
+
+    @Override
+    public TypeDef getServiceResponseDetails(String service) throws InterruptedException {
+        return getTypeDetails(getServiceType(service), "Response", "/rosapi/service_response_details");
+    }
+
+    @Override
+    public TypeDef[] getServiceResponseList(String service) throws InterruptedException {
+        return getTypeList(getServiceType(service), "Response", "/rosapi/service_response_details");
+    }
+
+    @Override
+    public TypeDef[] getTypeList(String type) throws InterruptedException {
+        return getTypeList(type, "", "/rosapi/message_details");
+    }
+
+    @Override
+    public TypeDef getTypeDetails(String type) throws InterruptedException {
+        return getTypeDetails(type, "", "/rosapi/message_details");
+    }
+
+    private TypeDef[] getTypeList(String type, String suffix, String serviceName) throws InterruptedException {
+        Service<Type, MessageDetails> messageDetailsService =
+                new Service<Type, MessageDetails>(serviceName,
+                        Type.class, MessageDetails.class, this);
+        return messageDetailsService.callBlocking(new Type(type)).typedefs;
+    }
+
+    private TypeDef getTypeDetails(String type, String suffix, String serviceName) throws InterruptedException {
+        Service<Type, MessageDetails> messageDetailsService =
+                new Service<Type, MessageDetails>(serviceName,
+                    Type.class, MessageDetails.class, this);
+        return findType(type + suffix, messageDetailsService.callBlocking(new Type(type)).typedefs);
+    }
+
+    private String getTopicType(String topic) throws InterruptedException {
+        Service<Topic, Type> topicTypeService =
+                new Service<Topic, Type>("/rosapi/topic_type",
+                    Topic.class, Type.class, this);
+        return topicTypeService.callBlocking(new Topic(topic)).type;
+    }
+
+    private String getServiceType(String service) throws InterruptedException {
+        Service<com.jilk.ros.rosapi.message.Service, Type> serviceTypeService =
+                new Service<com.jilk.ros.rosapi.message.Service, Type>("/rosapi/service_type",
+                        com.jilk.ros.rosapi.message.Service.class, Type.class, this);
+        return serviceTypeService.callBlocking(new com.jilk.ros.rosapi.message.Service(service)).type;
+    }
+        
+    private TypeDef findType(String type, TypeDef[] types) {
+        TypeDef result = null;
+        for (TypeDef t : types) {
+            if (t.type.equals(type)) {
+                result = t;
+                break;
+            }
+        }
+        //System.out.println("ROSBridgeClient.findType: ");
+        //result.print();
+        return result;
+    }
+    
+    @Override
+    public void typeMatch(TypeDef t, Class<? extends Message> c) throws InterruptedException {
+        if (c == null)
+            throw new RuntimeException("No registered message type found for: " + t.type);
+        Field[] fields = c.getFields();
+        for (int i = 0; i < t.fieldnames.length; i++) {
+            
+            // Field names
+            String classFieldName = fields[i].getName();
+            String typeFieldName = t.fieldnames[i];
+            if (!classFieldName.equals(typeFieldName))
+                typeMatchError(t, c, "field name", typeFieldName, classFieldName);
+            
+            // Array type of field
+            boolean typeIsArray = (t.fieldarraylen[i] >= 0);
+            boolean fieldIsArray = fields[i].getType().isArray();
+            if (typeIsArray != fieldIsArray)
+                typeMatchError(t, c, "array mismatch", typeFieldName, classFieldName);
+            
+            // Get base type of field
+            Class fieldClass = fields[i].getType();
+            if (fieldIsArray)
+                fieldClass = fields[i].getType().getComponentType();
+            String type = t.fieldtypes[i];
+            
+            // Field type for primitivesclient
+            if (Message.isPrimitive(fieldClass)) {
+                if (!TypeDef.match(type, fieldClass))
+                    typeMatchError(t, c, "type mismatch", type, fieldClass.getName());
+            }
+
+            // Field type for non-primitive classes, and recurse
+            else {
+                if (!Message.class.isAssignableFrom(fieldClass))
+                    throw new RuntimeException("Member " + classFieldName +
+                            " of class " + fieldClass.getName() + " does not extend Message.");
+                String fieldClassString = ((MessageType) fieldClass.getAnnotation(MessageType.class)).string();
+                if (!type.equals(fieldClassString))
+                    typeMatchError(t, c, "message type mismatch", type, fieldClassString);
+                typeMatch(getTypeDetails(type), fieldClass);
+            }                            
+        }
+    }
+    
+    private void typeMatchError(TypeDef t, Class<? extends Message> c,
+                                String error, String tString, String cString) {
+        throw new RuntimeException("Type match error between " +
+                t.type + " and " + c.getName() + ": " +
+                error + ": \'" + tString + "\' does not match \'" + cString + "\'.");
+    }
+    
+    @Override
+    public Object getUnderlyingClient() {
+        return client;
+    }    
+    
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/implementation/Base64.java

@@ -0,0 +1,575 @@
+package com.jilk.ros.rosbridge.implementation;
+
+import java.util.Arrays;
+
+/** A very fast and memory efficient class to encode and decode to and from BASE64 in full accordance
+ * with RFC 2045.<br><br>
+ * On Windows XP sp1 with 1.4.2_04 and later ;), this encoder and decoder is about 10 times faster
+ * on small arrays (10 - 1000 bytes) and 2-3 times as fast on larger arrays (10000 - 1000000 bytes)
+ * compared to <code>sun.misc.Encoder()/Decoder()</code>.<br><br>
+ *
+ * On byte arrays the encoder is about 20% faster than Jakarta Commons Base64 Codec for encode and
+ * about 50% faster for decoding large arrays. This implementation is about twice as fast on very small
+ * arrays (&lt 30 bytes). If source/destination is a <code>String</code> this
+ * version is about three times as fast due to the fact that the Commons Codec result has to be recoded
+ * to a <code>String</code> from <code>byte[]</code>, which is very expensive.<br><br>
+ *
+ * This encode/decode algorithm doesn't create any temporary arrays as many other codecs do, it only
+ * allocates the resulting array. This produces less garbage and it is possible to handle arrays twice
+ * as large as algorithms that create a temporary array. (E.g. Jakarta Commons Codec). It is unknown
+ * whether Sun's <code>sun.misc.Encoder()/Decoder()</code> produce temporary arrays but since performance
+ * is quite low it probably does.<br><br>
+ *
+ * The encoder produces the same output as the Sun one except that the Sun's encoder appends
+ * a trailing line separator if the last character isn't a pad. Unclear why but it only adds to the
+ * length and is probably a side effect. Both are in conformance with RFC 2045 though.<br>
+ * Commons codec seem to always att a trailing line separator.<br><br>
+ *
+ * <b>Note!</b>
+ * The encode/decode method pairs (types) come in three versions with the <b>exact</b> same algorithm and
+ * thus a lot of code redundancy. This is to not create any temporary arrays for transcoding to/from different
+ * format types. The methods not used can simply be commented out.<br><br>
+ *
+ * There is also a "fast" version of all decode methods that works the same way as the normal ones, but
+ * har a few demands on the decoded input. Normally though, these fast verions should be used if the source if
+ * the input is known and it hasn't bee tampered with.<br><br>
+ *
+ * If you find the code useful or you find a bug, please send me a note at base64 @ miginfocom . com.
+ *
+ * Licence (BSD):
+ * ==============
+ *
+ * Copyright (c) 2004, Mikael Grev, MiG InfoCom AB. (base64 @ miginfocom . com)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * Redistributions of source code must retain the above copyright notice, this list
+ * of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice, this
+ * list of conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution.
+ * Neither the name of the MiG InfoCom AB nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * @version 2.2
+ * @author Mikael Grev
+ *         Date: 2004-aug-02
+ *         Time: 11:31:11
+ */
+
+public class Base64
+{
+	private static final char[] CA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
+	private static final int[] IA = new int[256];
+	static {
+		Arrays.fill(IA, -1);
+		for (int i = 0, iS = CA.length; i < iS; i++)
+			IA[CA[i]] = i;
+		IA['='] = 0;
+	}
+
+	// ****************************************************************************************
+	// *  char[] version
+	// ****************************************************************************************
+
+	/** Encodes a raw byte array into a BASE64 <code>char[]</code> representation i accordance with RFC 2045.
+	 * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
+	 * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
+	 * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
+	 * little faster.
+	 * @return A BASE64 encoded array. Never <code>null</code>.
+	 */
+	public final static char[] encodeToChar(byte[] sArr, boolean lineSep)
+	{
+		// Check special case
+		int sLen = sArr != null ? sArr.length : 0;
+		if (sLen == 0)
+			return new char[0];
+
+		int eLen = (sLen / 3) * 3;              // Length of even 24-bits.
+		int cCnt = ((sLen - 1) / 3 + 1) << 2;   // Returned character count
+		int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned array
+		char[] dArr = new char[dLen];
+
+		// Encode even 24-bits
+		for (int s = 0, d = 0, cc = 0; s < eLen;) {
+			// Copy next three bytes into lower 24 bits of int, paying attension to sign.
+			int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
+
+			// Encode the int into four chars
+			dArr[d++] = CA[(i >>> 18) & 0x3f];
+			dArr[d++] = CA[(i >>> 12) & 0x3f];
+			dArr[d++] = CA[(i >>> 6) & 0x3f];
+			dArr[d++] = CA[i & 0x3f];
+
+			// Add optional line separator
+			if (lineSep && ++cc == 19 && d < dLen - 2) {
+				dArr[d++] = '\r';
+				dArr[d++] = '\n';
+				cc = 0;
+			}
+		}
+
+		// Pad and encode last bits if source isn't even 24 bits.
+		int left = sLen - eLen; // 0 - 2.
+		if (left > 0) {
+			// Prepare the int
+			int i = ((sArr[eLen] & 0xff) << 10) | (left == 2 ? ((sArr[sLen - 1] & 0xff) << 2) : 0);
+
+			// Set last four chars
+			dArr[dLen - 4] = CA[i >> 12];
+			dArr[dLen - 3] = CA[(i >>> 6) & 0x3f];
+			dArr[dLen - 2] = left == 2 ? CA[i & 0x3f] : '=';
+			dArr[dLen - 1] = '=';
+		}
+		return dArr;
+	}
+
+	/** Decodes a BASE64 encoded char array. All illegal characters will be ignored and can handle both arrays with
+	 * and without line separators.
+	 * @param sArr The source array. <code>null</code> or length 0 will return an empty array.
+	 * @return The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
+	 * (including '=') isn't divideable by 4.  (I.e. definitely corrupted).
+	 */
+	public final static byte[] decode(char[] sArr)
+	{
+		// Check special case
+		int sLen = sArr != null ? sArr.length : 0;
+		if (sLen == 0)
+			return new byte[0];
+
+		// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
+		// so we don't have to reallocate & copy it later.
+		int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
+		for (int i = 0; i < sLen; i++)  // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
+			if (IA[sArr[i]] < 0)
+				sepCnt++;
+
+		// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
+		if ((sLen - sepCnt) % 4 != 0)
+			return null;
+
+		int pad = 0;
+		for (int i = sLen; i > 1 && IA[sArr[--i]] <= 0;)
+			if (sArr[i] == '=')
+				pad++;
+
+		int len = ((sLen - sepCnt) * 6 >> 3) - pad;
+
+		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
+
+		for (int s = 0, d = 0; d < len;) {
+			// Assemble three bytes into an int from four "valid" characters.
+			int i = 0;
+			for (int j = 0; j < 4; j++) {   // j only increased if a valid char was found.
+				int c = IA[sArr[s++]];
+				if (c >= 0)
+				    i |= c << (18 - j * 6);
+				else
+					j--;
+			}
+			// Add the bytes
+			dArr[d++] = (byte) (i >> 16);
+			if (d < len) {
+				dArr[d++]= (byte) (i >> 8);
+				if (d < len)
+					dArr[d++] = (byte) i;
+			}
+		}
+		return dArr;
+	}
+
+	/** Decodes a BASE64 encoded char array that is known to be resonably well formatted. The method is about twice as
+	 * fast as {@link #decode(char[])}. The preconditions are:<br>
+	 * + The array must have a line length of 76 chars OR no line separators at all (one line).<br>
+	 * + Line separator must be "\r\n", as specified in RFC 2045
+	 * + The array must not contain illegal characters within the encoded string<br>
+	 * + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br>
+	 * @param sArr The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.
+	 * @return The decoded array of bytes. May be of length 0.
+	 */
+	public final static byte[] decodeFast(char[] sArr)
+	{
+		// Check special case
+		int sLen = sArr.length;
+		if (sLen == 0)
+			return new byte[0];
+
+		int sIx = 0, eIx = sLen - 1;    // Start and end index after trimming.
+
+		// Trim illegal chars from start
+		while (sIx < eIx && IA[sArr[sIx]] < 0)
+			sIx++;
+
+		// Trim illegal chars from end
+		while (eIx > 0 && IA[sArr[eIx]] < 0)
+			eIx--;
+
+		// get the padding count (=) (0, 1 or 2)
+		int pad = sArr[eIx] == '=' ? (sArr[eIx - 1] == '=' ? 2 : 1) : 0;  // Count '=' at end.
+		int cCnt = eIx - sIx + 1;   // Content count including possible separators
+		int sepCnt = sLen > 76 ? (sArr[76] == '\r' ? cCnt / 78 : 0) << 1 : 0;
+
+		int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
+		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
+
+		// Decode all but the last 0 - 2 bytes.
+		int d = 0;
+		for (int cc = 0, eLen = (len / 3) * 3; d < eLen;) {
+			// Assemble three bytes into an int from four "valid" characters.
+			int i = IA[sArr[sIx++]] << 18 | IA[sArr[sIx++]] << 12 | IA[sArr[sIx++]] << 6 | IA[sArr[sIx++]];
+
+			// Add the bytes
+			dArr[d++] = (byte) (i >> 16);
+			dArr[d++] = (byte) (i >> 8);
+			dArr[d++] = (byte) i;
+
+			// If line separator, jump over it.
+			if (sepCnt > 0 && ++cc == 19) {
+				sIx += 2;
+				cc = 0;
+			}
+		}
+
+		if (d < len) {
+			// Decode last 1-3 bytes (incl '=') into 1-3 bytes
+			int i = 0;
+			for (int j = 0; sIx <= eIx - pad; j++)
+				i |= IA[sArr[sIx++]] << (18 - j * 6);
+
+			for (int r = 16; d < len; r -= 8)
+				dArr[d++] = (byte) (i >> r);
+		}
+
+		return dArr;
+	}
+
+	// ****************************************************************************************
+	// *  byte[] version
+	// ****************************************************************************************
+
+	/** Encodes a raw byte array into a BASE64 <code>byte[]</code> representation i accordance with RFC 2045.
+	 * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
+	 * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
+	 * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
+	 * little faster.
+	 * @return A BASE64 encoded array. Never <code>null</code>.
+	 */
+	public final static byte[] encodeToByte(byte[] sArr, boolean lineSep)
+	{
+		// Check special case
+		int sLen = sArr != null ? sArr.length : 0;
+		if (sLen == 0)
+			return new byte[0];
+
+		int eLen = (sLen / 3) * 3;                              // Length of even 24-bits.
+		int cCnt = ((sLen - 1) / 3 + 1) << 2;                   // Returned character count
+		int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned array
+		byte[] dArr = new byte[dLen];
+
+		// Encode even 24-bits
+		for (int s = 0, d = 0, cc = 0; s < eLen;) {
+			// Copy next three bytes into lower 24 bits of int, paying attension to sign.
+			int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
+
+			// Encode the int into four chars
+			dArr[d++] = (byte) CA[(i >>> 18) & 0x3f];
+			dArr[d++] = (byte) CA[(i >>> 12) & 0x3f];
+			dArr[d++] = (byte) CA[(i >>> 6) & 0x3f];
+			dArr[d++] = (byte) CA[i & 0x3f];
+
+			// Add optional line separator
+			if (lineSep && ++cc == 19 && d < dLen - 2) {
+				dArr[d++] = '\r';
+				dArr[d++] = '\n';
+				cc = 0;
+			}
+		}
+
+		// Pad and encode last bits if source isn't an even 24 bits.
+		int left = sLen - eLen; // 0 - 2.
+		if (left > 0) {
+			// Prepare the int
+			int i = ((sArr[eLen] & 0xff) << 10) | (left == 2 ? ((sArr[sLen - 1] & 0xff) << 2) : 0);
+
+			// Set last four chars
+			dArr[dLen - 4] = (byte) CA[i >> 12];
+			dArr[dLen - 3] = (byte) CA[(i >>> 6) & 0x3f];
+			dArr[dLen - 2] = left == 2 ? (byte) CA[i & 0x3f] : (byte) '=';
+			dArr[dLen - 1] = '=';
+		}
+		return dArr;
+	}
+
+	/** Decodes a BASE64 encoded byte array. All illegal characters will be ignored and can handle both arrays with
+	 * and without line separators.
+	 * @param sArr The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.
+	 * @return The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
+	 * (including '=') isn't divideable by 4. (I.e. definitely corrupted).
+	 */
+	public final static byte[] decode(byte[] sArr)
+	{
+		// Check special case
+		int sLen = sArr.length;
+
+		// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
+		// so we don't have to reallocate & copy it later.
+		int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
+		for (int i = 0; i < sLen; i++)      // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
+			if (IA[sArr[i] & 0xff] < 0)
+				sepCnt++;
+
+		// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
+		if ((sLen - sepCnt) % 4 != 0)
+			return null;
+
+		int pad = 0;
+		for (int i = sLen; i > 1 && IA[sArr[--i] & 0xff] <= 0;)
+			if (sArr[i] == '=')
+				pad++;
+
+		int len = ((sLen - sepCnt) * 6 >> 3) - pad;
+
+		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
+
+		for (int s = 0, d = 0; d < len;) {
+			// Assemble three bytes into an int from four "valid" characters.
+			int i = 0;
+			for (int j = 0; j < 4; j++) {   // j only increased if a valid char was found.
+				int c = IA[sArr[s++] & 0xff];
+				if (c >= 0)
+				    i |= c << (18 - j * 6);
+				else
+					j--;
+			}
+
+			// Add the bytes
+			dArr[d++] = (byte) (i >> 16);
+			if (d < len) {
+				dArr[d++]= (byte) (i >> 8);
+				if (d < len)
+					dArr[d++] = (byte) i;
+			}
+		}
+
+		return dArr;
+	}
+
+
+	/** Decodes a BASE64 encoded byte array that is known to be resonably well formatted. The method is about twice as
+	 * fast as {@link #decode(byte[])}. The preconditions are:<br>
+	 * + The array must have a line length of 76 chars OR no line separators at all (one line).<br>
+	 * + Line separator must be "\r\n", as specified in RFC 2045
+	 * + The array must not contain illegal characters within the encoded string<br>
+	 * + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br>
+	 * @param sArr The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.
+	 * @return The decoded array of bytes. May be of length 0.
+	 */
+	public final static byte[] decodeFast(byte[] sArr)
+	{
+		// Check special case
+		int sLen = sArr.length;
+		if (sLen == 0)
+			return new byte[0];
+
+		int sIx = 0, eIx = sLen - 1;    // Start and end index after trimming.
+
+		// Trim illegal chars from start
+		while (sIx < eIx && IA[sArr[sIx] & 0xff] < 0)
+			sIx++;
+
+		// Trim illegal chars from end
+		while (eIx > 0 && IA[sArr[eIx] & 0xff] < 0)
+			eIx--;
+
+		// get the padding count (=) (0, 1 or 2)
+		int pad = sArr[eIx] == '=' ? (sArr[eIx - 1] == '=' ? 2 : 1) : 0;  // Count '=' at end.
+		int cCnt = eIx - sIx + 1;   // Content count including possible separators
+		int sepCnt = sLen > 76 ? (sArr[76] == '\r' ? cCnt / 78 : 0) << 1 : 0;
+
+		int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
+		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
+
+		// Decode all but the last 0 - 2 bytes.
+		int d = 0;
+		for (int cc = 0, eLen = (len / 3) * 3; d < eLen;) {
+			// Assemble three bytes into an int from four "valid" characters.
+			int i = IA[sArr[sIx++]] << 18 | IA[sArr[sIx++]] << 12 | IA[sArr[sIx++]] << 6 | IA[sArr[sIx++]];
+
+			// Add the bytes
+			dArr[d++] = (byte) (i >> 16);
+			dArr[d++] = (byte) (i >> 8);
+			dArr[d++] = (byte) i;
+
+			// If line separator, jump over it.
+			if (sepCnt > 0 && ++cc == 19) {
+				sIx += 2;
+				cc = 0;
+			}
+		}
+
+		if (d < len) {
+			// Decode last 1-3 bytes (incl '=') into 1-3 bytes
+			int i = 0;
+			for (int j = 0; sIx <= eIx - pad; j++)
+				i |= IA[sArr[sIx++]] << (18 - j * 6);
+
+			for (int r = 16; d < len; r -= 8)
+				dArr[d++] = (byte) (i >> r);
+		}
+
+		return dArr;
+	}
+
+	// ****************************************************************************************
+	// * String version
+	// ****************************************************************************************
+
+	/** Encodes a raw byte array into a BASE64 <code>String</code> representation i accordance with RFC 2045.
+	 * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
+	 * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
+	 * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
+	 * little faster.
+	 * @return A BASE64 encoded array. Never <code>null</code>.
+	 */
+	public final static String encodeToString(byte[] sArr, boolean lineSep)
+	{
+		// Reuse char[] since we can't create a String incrementally anyway and StringBuffer/Builder would be slower.
+		return new String(encodeToChar(sArr, lineSep));
+	}
+
+	/** Decodes a BASE64 encoded <code>String</code>. All illegal characters will be ignored and can handle both strings with
+	 * and without line separators.<br>
+	 * <b>Note!</b> It can be up to about 2x the speed to call <code>decode(str.toCharArray())</code> instead. That
+	 * will create a temporary array though. This version will use <code>str.charAt(i)</code> to iterate the string.
+	 * @param str The source string. <code>null</code> or length 0 will return an empty array.
+	 * @return The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
+	 * (including '=') isn't divideable by 4.  (I.e. definitely corrupted).
+	 */
+	public final static byte[] decode(String str)
+	{
+		// Check special case
+		int sLen = str != null ? str.length() : 0;
+		if (sLen == 0)
+			return new byte[0];
+
+		// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
+		// so we don't have to reallocate & copy it later.
+		int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
+		for (int i = 0; i < sLen; i++)  // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
+			if (IA[str.charAt(i)] < 0)
+				sepCnt++;
+
+		// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
+		if ((sLen - sepCnt) % 4 != 0)
+			return null;
+
+		// Count '=' at end
+		int pad = 0;
+		for (int i = sLen; i > 1 && IA[str.charAt(--i)] <= 0;)
+			if (str.charAt(i) == '=')
+				pad++;
+
+		int len = ((sLen - sepCnt) * 6 >> 3) - pad;
+
+		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
+
+		for (int s = 0, d = 0; d < len;) {
+			// Assemble three bytes into an int from four "valid" characters.
+			int i = 0;
+			for (int j = 0; j < 4; j++) {   // j only increased if a valid char was found.
+				int c = IA[str.charAt(s++)];
+				if (c >= 0)
+				    i |= c << (18 - j * 6);
+				else
+					j--;
+			}
+			// Add the bytes
+			dArr[d++] = (byte) (i >> 16);
+			if (d < len) {
+				dArr[d++]= (byte) (i >> 8);
+				if (d < len)
+					dArr[d++] = (byte) i;
+			}
+		}
+		return dArr;
+	}
+
+	/** Decodes a BASE64 encoded string that is known to be resonably well formatted. The method is about twice as
+	 * fast as {@link #decode(String)}. The preconditions are:<br>
+	 * + The array must have a line length of 76 chars OR no line separators at all (one line).<br>
+	 * + Line separator must be "\r\n", as specified in RFC 2045
+	 * + The array must not contain illegal characters within the encoded string<br>
+	 * + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br>
+	 * @param s The source string. Length 0 will return an empty array. <code>null</code> will throw an exception.
+	 * @return The decoded array of bytes. May be of length 0.
+	 */
+	public final static byte[] decodeFast(String s)
+	{
+		// Check special case
+		int sLen = s.length();
+		if (sLen == 0)
+			return new byte[0];
+
+		int sIx = 0, eIx = sLen - 1;    // Start and end index after trimming.
+
+		// Trim illegal chars from start
+		while (sIx < eIx && IA[s.charAt(sIx) & 0xff] < 0)
+			sIx++;
+
+		// Trim illegal chars from end
+		while (eIx > 0 && IA[s.charAt(eIx) & 0xff] < 0)
+			eIx--;
+
+		// get the padding count (=) (0, 1 or 2)
+		int pad = s.charAt(eIx) == '=' ? (s.charAt(eIx - 1) == '=' ? 2 : 1) : 0;  // Count '=' at end.
+		int cCnt = eIx - sIx + 1;   // Content count including possible separators
+		int sepCnt = sLen > 76 ? (s.charAt(76) == '\r' ? cCnt / 78 : 0) << 1 : 0;
+
+		int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
+		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
+
+		// Decode all but the last 0 - 2 bytes.
+		int d = 0;
+		for (int cc = 0, eLen = (len / 3) * 3; d < eLen;) {
+			// Assemble three bytes into an int from four "valid" characters.
+			int i = IA[s.charAt(sIx++)] << 18 | IA[s.charAt(sIx++)] << 12 | IA[s.charAt(sIx++)] << 6 | IA[s.charAt(sIx++)];
+
+			// Add the bytes
+			dArr[d++] = (byte) (i >> 16);
+			dArr[d++] = (byte) (i >> 8);
+			dArr[d++] = (byte) i;
+
+			// If line separator, jump over it.
+			if (sepCnt > 0 && ++cc == 19) {
+				sIx += 2;
+				cc = 0;
+			}
+		}
+
+		if (d < len) {
+			// Decode last 1-3 bytes (incl '=') into 1-3 bytes
+			int i = 0;
+			for (int j = 0; sIx <= eIx - pad; j++)
+				i |= IA[s.charAt(sIx++)] << (18 - j * 6);
+
+			for (int r = 16; d < len; r -= 8)
+				dArr[d++] = (byte) (i >> r);
+		}
+
+		return dArr;
+	}
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/implementation/JSON.java

@@ -0,0 +1,335 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge.implementation;
+
+import com.jilk.ros.message.Message;
+import com.jilk.ros.rosbridge.indication.Indication;
+import com.jilk.ros.rosbridge.operation.Wrapper;
+
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+
+import java.io.StringReader;
+import java.lang.reflect.Array;
+import java.lang.reflect.Field;
+
+
+// The slightly crazy abstractions here are designed to isolate knowledge of
+//    the JSON library and data types from the Operation details of rosbridge.
+//    Why is this important?  A few reasons I can see.  First, we might want
+//    to change JSON libraries and this encapsulates all use of JSON-simple.
+//    Second, as much as possible I would like the semantics of the rosbridge
+//    protocol to be encapsulated in the Operation and its subclasses rather
+//    than in a module that is essentially about serialization.
+//
+//    Unfortunately the hierarchical Message abstraction is a bit broken 
+//    at the top level. Beginning at the actual operation (e.g., Publish), the
+//    types of the fields are determined either by the fields themselves or by
+//    an indicator.  However, the type of the operation itself is not determined
+//    this way, because the indicator is in the object itself, which means it
+//    would have to be created before its type is known. Rather than build in
+//    exceptions, I elected to create a "Wrapper" operation type that simply
+//    wraps the concrete operation and copies its "op" field.
+//    
+
+public class JSON {
+
+    /**
+     * Translates a Message recursively into JSON. Normally the Message is also an
+     * Operation, but it does not have to be. The caller constructs a complete
+     * message using @Operation and @Message types. This includes situations
+     * where one or more fields are marked to be turned into arrays, using @AsArray. 
+     * @param m  the @Message object to be recursively translated.
+     * @return   the complete JSON string.
+     */
+    public static String toJSON(Message m) {
+        JSONObject jo = convertObjectToJSONObject(m); // Object to JSON-Simple
+        return jo.toJSONString();                     // JSON-Simple to string
+    }
+    
+    /**
+     * Translates JSON into a hierarchical Operation/Message structure.
+     * This includes handling fields that are @Indicated and @AsArray. If the
+     * @Class parameter is a @Wrapper, this is a special case whereby the
+     * object is wrapped to create a consistent hierarchy. 
+     * @param json  the source JSON string
+     * @param c     the top level class of the JSON. Normally @Wrapper
+     * @param r     the @Registry containing topic registrations
+     * @return      the fully instantiated message hierarchy represented
+     *              by the JSON string.
+     */
+    public static Message toMessage(String json, Class c, Registry<Class> r) {
+        JSONObject joUnwrapped = convertStringToJSONObject(json); // String to JSON-Simple
+        JSONObject jo = joUnwrapped;
+        if (Wrapper.class.isAssignableFrom(c))
+            jo = wrap(joUnwrapped, c);                            // wrap: a hack to make the hierarchy homogeneous
+        return convertJSONObjectToMessage(jo, c, r);              // JSON-Simple to Message
+    }
+    
+    // *** Create JSON from Messages *** //
+    
+    // Translate the object into a JSON-Simple object, field-by-field,
+    //   recursively via convertElementToJSON.
+    //   except for the case where AsArray is indicated
+    private static JSONObject convertObjectToJSONObject(Object o) {
+        JSONObject result = new JSONObject();
+        for (Field f : o.getClass().getFields()) {
+            Object fieldObject = getFieldObject(f, o);
+            if (fieldObject != null) {
+                Object resultObject;
+                if (Indication.isBase64Encoded(f))
+                    resultObject = convertByteArrayToBase64JSONString(fieldObject);
+                else if (Indication.asArray(f))
+                    resultObject = convertObjectToJSONArray(fieldObject);
+                else resultObject = convertElementToJSON(fieldObject);
+                result.put(f.getName(), resultObject);
+            }
+        }
+        return result;
+    }
+    
+    // Convert an array type to a JSON-Simple array, element-by-element,
+    //    recursively via convertElementToJSON.
+    private static JSONArray convertArrayToJSONArray(Object array) {
+        JSONArray result = new JSONArray();
+        for (int i = 0; i < Array.getLength(array); i++) {
+            Object elementObject = Array.get(array, i);
+            if (elementObject != null) {
+                Object resultObject = convertElementToJSON(elementObject);
+                result.add(resultObject);
+            }
+        }        
+        return result;
+    }
+    
+    // For AsArray objects, convert the object to a JSON-Simple array
+    //     NOTE: This relies on later versions of the JDK providing 
+    //           the fields in order.
+    private static JSONArray convertObjectToJSONArray(Object o) {
+        JSONArray result = new JSONArray();
+        for (Field f : o.getClass().getFields()) {
+            Object fieldObject = getFieldObject(f, o);
+            if (fieldObject != null) {
+                Object resultObject = convertElementToJSON(fieldObject);
+                result.add(resultObject);
+            }
+        }
+        return result;
+    }
+            
+    // Convert the individual field or array element items recursively
+    private static Object convertElementToJSON(Object elementObject) {
+        Class elementClass = elementObject.getClass();
+        Object resultObject;
+        if (Message.isPrimitive(elementClass))
+            resultObject = elementObject;
+        else if (elementClass.isArray())  
+            resultObject = convertArrayToJSONArray(elementObject);
+        else
+            resultObject = convertObjectToJSONObject(elementObject);
+        return resultObject;
+    }
+
+    // Special case for Base 64-encoded fields
+    private static Object convertByteArrayToBase64JSONString(Object fieldObject) {
+        return Base64.encodeToString((byte[]) fieldObject, false);    
+    }
+    
+    // This is just to buffer the code from the exception. Better error
+    //    handling needed here.
+    private static Object getFieldObject(Field f, Object o) {
+        Object fo = null;
+        try {
+            fo = f.get(o);
+        }
+        catch (IllegalAccessException ex) {
+            ex.printStackTrace();
+        }
+        return fo;
+    }        
+    
+    // *** Create Messages from JSON *** //
+    
+    // Use the JSON-simple parser to create the JSON-Simple object
+    private static JSONObject convertStringToJSONObject(String json) {
+        JSONObject result = null;
+        StringReader r = new StringReader(json);
+        JSONParser jp = new JSONParser();
+        try {
+            result = (JSONObject) jp.parse(r);
+        }
+        catch (Throwable t) {
+            System.out.println(t.getMessage());
+        }
+        r.close();        
+        return result;
+    }
+    
+    // A bit of a hack to create a consistent hierarchy with jsonbridge operations
+    // At least it does not depend on any specific field names, it just copies the 
+    // Indicator and Indicated fields.
+    private static JSONObject wrap(JSONObject jo, Class c) {
+        JSONObject result = new JSONObject();
+        String indicatorName = Indication.getIndicatorName(c);
+        String indicatedName = Indication.getIndicatedName(c);
+        result.put(indicatorName, jo.get(indicatorName));
+        result.put(indicatedName, jo);
+        return result;
+    }
+            
+    // Convert the JSON-Simple object to the indicated message, field-by-field
+    //    recursively via convertElementToField.
+    private static Message convertJSONObjectToMessage(JSONObject jo, Class c, Registry<Class> r) {
+        //System.out.println("JSON.convertJSONObjectToMessage: " + jo.toJSONString());
+        try {
+            Message result = (Message) c.newInstance();
+            for (Field f : c.getFields()) {
+                Class fc = getFieldClass(result, jo, f, r);
+                Object lookup = jo.get(f.getName());
+                if (lookup != null) {
+                    Object value = convertElementToField(lookup, fc, f, r);
+                    f.set(result, value);
+                }
+            }      
+            return result;
+        }
+        catch (Exception ex) {
+            //ex.printStackTrace();
+            return null;
+        }        
+    }
+
+    // Convert the JSON-Simple array to the indicated message, element-by-element
+    //    recursively via convertElementToField.
+    private static Object convertJSONArrayToArray(JSONArray ja, Class c, Registry<Class> r) {
+        Object result = Array.newInstance(c, ja.size());
+        for (int i = 0; i < ja.size(); i++) {
+            Object lookup = ja.get(i);
+            Object value = null;
+            if (lookup != null) {
+                if (lookup.getClass().equals(JSONObject.class))
+                    value = convertJSONObjectToMessage((JSONObject) lookup, c, r);
+                else if (lookup.getClass().equals(JSONArray.class))  // this is not actually allowed in ROS
+                    value = convertJSONArrayToArray((JSONArray) lookup, c.getComponentType(), r);
+                else 
+                    value = convertJSONPrimitiveToPrimitive(lookup, c);
+                Array.set(result, i, value);
+            }
+        }
+        
+        return result;
+    }
+    
+    // Convert a JSON-Simple array to a Message, field-by-field of the Message,
+    //     element-by-element of the array, recursively via convertElementToField.
+    //     NOTE: This relies on later versions of the JDK providing 
+    //           the fields in order.
+    private static Message convertJSONArrayToMessage(JSONArray ja, Class c, Registry<Class> r) {
+        try {
+            Message result = (Message) c.newInstance();
+            int arrayIndex = 0;
+            for (Field f : c.getFields()) {
+                Class fc = getFieldClass(result, null, f, r);
+                Object lookup = ja.get(arrayIndex++);         // yes we are assuming that the fields are delivered in order
+                if (lookup != null) {
+                    Object value = convertElementToField(lookup, fc, f, r);
+                    f.set(result, value);
+                }
+            }
+            
+            return result;
+        }
+        catch (Exception ex) {
+            ex.printStackTrace();
+            return null;
+        }        
+    }
+
+    // Convert an individual array or object element to a field in the Message,
+    //    recursively, and applying AsArray if needed.
+    private static Object convertElementToField(Object element, Class fc, Field f, Registry<Class> r) {
+        //System.out.println("JSON.convertElementToField: " + f.getName() + " " + fc.getName());
+        Object value;
+        if (element.getClass().equals(JSONObject.class)) {
+            //System.out.println("JSON.convertElementToField: JSON Object " + ((JSONObject) element).toJSONString());
+            value = convertJSONObjectToMessage((JSONObject) element, fc, r);
+        }
+        else if (element.getClass().equals(JSONArray.class)) {
+            //System.out.println("JSON.convertElementToField: JSON Array " + ((JSONArray) element).toJSONString());
+            if (Indication.asArray(f))
+                value = convertJSONArrayToMessage((JSONArray) element, fc, r);
+            else value = convertJSONArrayToArray((JSONArray) element, fc, r);
+        }
+        else {
+            //System.out.println("JSON.convertElementToField: Primitive " + element);
+            if (Indication.isBase64Encoded(f))
+                value = convertBase64JSONStringToByteArray(element);
+            else value = convertJSONPrimitiveToPrimitive(element, fc);
+        }
+         
+        return value;        
+    }
+    
+    // Note that this is not checking ranges
+    public static Object convertJSONPrimitiveToPrimitive(Object o, Class c) {
+        Object result = o;
+        if (c.isPrimitive() || Number.class.isAssignableFrom(c)) {
+            if (c.equals(double.class) || c.equals(Double.class))
+                result = new Double(((Number) o).doubleValue());
+            else if (c.equals(float.class) || c.equals(Float.class))
+                result = new Float(((Number) o).floatValue());
+            else if (c.equals(long.class) || c.equals(Long.class))
+                result = new Long(((Number) o).longValue());
+            else if (int.class.equals(c) || c.equals(Integer.class))
+                result = new Integer(((Number) o).intValue());
+            else if (c.equals(short.class) || c.equals(Short.class))
+                result = new Short(((Number) o).shortValue());
+            else if (c.equals(byte.class) || c.equals(Byte.class))
+                result = new Byte(((Number) o).byteValue());
+        }
+        return result;
+    }
+    
+    public static byte[] convertBase64JSONStringToByteArray(Object element) {
+        return Base64.decode((String) element);
+    }    
+
+    // Determine the target class of a field in the object or array, based
+    //    directly on the field's type, or using the Indicator if applicable,    
+    //    The Indicator field only provides the topic/service, so we have to look
+    //    up the Class in the registry.
+    public static Class getFieldClass(Message parent, JSONObject jo, Field f, Registry<Class> r) {
+        Class fc;
+        fc = f.getType();
+        if (fc.isArray())
+            fc = f.getType().getComponentType();
+        if (Indication.isIndicated(f) && (jo != null)) {
+            //fc = Indication.getIndication(parent,
+            //        (String) jo.get(Indication.getIndicatorName(parent.getClass())));
+            fc = r.lookup(parent.getClass(),
+                    (String) jo.get(Indication.getIndicatorName(parent.getClass())));
+            //System.out.println("JSON.getFieldClass: parent class " + parent.getClass().getName() +
+            //        " Indicator: " + Indication.getIndicatorName(parent.getClass()) + 
+            //        " result: " + fc.getName());
+        }
+        return fc;
+    }            
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/implementation/PublishEvent.java

@@ -0,0 +1,24 @@
+package com.jilk.ros.rosbridge.implementation;
+
+import com.jilk.ros.rosbridge.operation.Operation;
+
+/**EventBus event entity,describe ros server response info
+ * Created by xxhong on 16-11-22.
+ */
+
+public class PublishEvent {
+    public String msg;
+    public String id;
+    public String name;
+    public String op;
+
+
+    public PublishEvent(Operation operation, String name, String content) {
+        if(operation != null) {
+            id = operation.id;
+            op = operation.op;
+        }
+        this.name = name;
+        msg = content;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/implementation/ROSBridgeWebSocketClient.java

@@ -0,0 +1,202 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * <p>
+ * This file is part of the Java ROSBridge Client.
+ * <p>
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * <p>
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * <p>
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ */
+package com.jilk.ros.rosbridge.implementation;
+
+import com.jilk.ros.ROSClient;
+import com.jilk.ros.message.Message;
+import com.jilk.ros.rosbridge.FullMessageHandler;
+import com.jilk.ros.rosbridge.operation.Operation;
+import com.jilk.ros.rosbridge.operation.Publish;
+import com.jilk.ros.rosbridge.operation.ServiceResponse;
+
+import org.java_websocket.client.WebSocketClient;
+import org.java_websocket.framing.CloseFrame;
+import org.java_websocket.handshake.ServerHandshake;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
+import java.lang.reflect.Field;
+import java.net.Socket;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.channels.SocketChannel;
+
+import de.greenrobot.event.EventBus;
+
+public class ROSBridgeWebSocketClient extends WebSocketClient {
+    private Registry<Class> classes;
+    private Registry<FullMessageHandler> handlers;
+    private boolean debug;
+    private ROSClient.ConnectionStatusListener listener;
+
+    ROSBridgeWebSocketClient(URI serverURI) {
+        super(serverURI);
+        classes = new Registry<Class>();
+        handlers = new Registry<FullMessageHandler>();
+        Operation.initialize(classes);  // note, this ensures that the Message Map is initialized too
+        listener = null;
+    }
+
+    public static ROSBridgeWebSocketClient create(String URIString) {
+        ROSBridgeWebSocketClient client = null;
+        try {
+            URI uri = new URI(URIString);
+            client = new ROSBridgeWebSocketClient(uri);
+        } catch (URISyntaxException ex) {
+            ex.printStackTrace();
+        }
+        return client;
+    }
+
+    public void setListener(ROSClient.ConnectionStatusListener listener) {
+        this.listener = listener;
+    }
+
+    @Override
+    public void onOpen(ServerHandshake handshakedata) {
+        if (listener != null)
+            listener.onConnect();
+    }
+
+    @Override
+    public void onMessage(String message) {
+        if (debug) System.out.println("<ROS " + message);
+        //System.out.println("ROSBridgeWebSocketClient.onMessage (message): " + message);
+        Operation operation = Operation.toOperation(message, classes);
+        //System.out.println("ROSBridgeWebSocketClient.onMessage (operation): ");
+        //operation.print();
+
+        FullMessageHandler handler = null;
+        Message msg = null;
+        if (operation instanceof Publish) {
+            Publish p = (Publish) operation;
+            handler = handlers.lookup(Publish.class, p.topic);
+            msg = p.msg;
+        } else if (operation instanceof ServiceResponse) {
+            ServiceResponse r = ((ServiceResponse) operation);
+            handler = handlers.lookup(ServiceResponse.class, r.service);
+            msg = r.values;
+        }
+        // later we will add clauses for Fragment, PNG, and Status. When rosbridge has it, we'll have one for service requests.
+
+        // need to handle "result: null" possibility for ROSBridge service responses
+        // this is probably some sort of call to the operation for "validation." Do it
+        // as part of error handling.
+
+        if (handler != null && message.contains("\"id\":"))
+            handler.onMessage(operation.id, msg);
+        else {
+            if (debug)
+                System.out.print("No handler: id# " + operation.id + ", op:" + operation.op);
+            if (operation instanceof Publish) {
+                Publish publish = ((Publish) operation);
+                JSONParser jsonParser = new JSONParser();
+                try {
+                    JSONObject jsonObject = (JSONObject) jsonParser.parse(message);
+                    String content = jsonObject.get("msg").toString();
+                    EventBus.getDefault().post(new PublishEvent(operation, publish.topic, content));
+                } catch (ParseException e) {
+                    e.printStackTrace();
+                }
+
+                System.out.println("Publish " + publish.topic);
+            } else if (operation instanceof ServiceResponse) {
+                ServiceResponse serviceResponse = ((ServiceResponse) operation);
+                JSONParser jsonParser = new JSONParser();
+                try {
+                    JSONObject jsonObject = (JSONObject) jsonParser.parse(message);
+                    String content = jsonObject.get("values").toString();
+                    System.out.println(content);
+                    EventBus.getDefault().post(new PublishEvent(operation, serviceResponse.service, content));
+                } catch (ParseException e) {
+                    e.printStackTrace();
+                }
+
+                System.out.println("Service Response " + serviceResponse.service);
+            }
+        }
+    }
+
+    @Override
+    public void onClose(int code, String reason, boolean remote) {
+        if (listener != null) {
+            boolean normal = (remote || (code == CloseFrame.NORMAL));
+            listener.onDisconnect(normal, reason, code);
+        }
+    }
+
+    @Override
+    public void onError(Exception ex) {
+        if (listener != null)
+            listener.onError(ex);
+        else ex.printStackTrace();
+    }
+
+    // There is a bug in V1.2 of java_websockets that seems to appear only in Android, specifically,
+    //    it does not shut down the thread and starts using gobs of RAM (symptom is frequent garbage collection).
+    //    This method goes into the WebSocketClient object and hard-closes the socket, which causes the thread
+    //    to exit (note, just interrupting the thread does not work).
+    @Override
+    public void closeBlocking() throws InterruptedException {
+        super.closeBlocking();
+        try {
+            Field channelField = this.getClass().getSuperclass().getDeclaredField("channel");
+            channelField.setAccessible(true);
+            SocketChannel channel = (SocketChannel) channelField.get(this);
+            if (channel != null && channel.isOpen()) {
+                Socket socket = channel.socket();
+                if (socket != null)
+                    socket.close();
+            }
+        } catch (Exception ex) {
+            System.out.println("Exception in Websocket close hack.");
+            ex.printStackTrace();
+        }
+    }
+
+    public void send(Operation operation) {
+        String json = operation.toJSON();
+        if (debug) System.out.println("ROS> " + json);
+        send(json);
+    }
+
+    public void register(Class<? extends Operation> c,
+                         String s,
+                         Class<? extends Message> m,
+                         FullMessageHandler h) {
+        Message.register(m, classes.get(Message.class));
+        classes.register(c, s, m);
+        if (h != null)
+            handlers.register(c, s, h);
+    }
+
+    public void unregister(Class<? extends Operation> c, String s) {
+        handlers.unregister(c, s);
+        // Note that there is no concept of unregistering a class - it can get replaced is all
+    }
+
+    public Class<? extends Message> getRegisteredMessage(String messageString) {
+        return classes.lookup(Message.class, messageString);
+    }
+
+    public void setDebug(boolean debug) {
+        this.debug = debug;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/implementation/Registry.java

@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge.implementation;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Registry<T> extends HashMap<Class, Map<String, T>> {
+    
+    public void register(Class c, String s, T t) {
+        Map<String, T> table = get(c);
+        if (table == null) {
+            table = new HashMap<String, T>();
+            put(c, table);
+        }
+        table.put(s, t);
+    }
+    
+    public void unregister(Class c, String s) {
+        Map<String, T> table = get(c);
+        if (table != null)
+            table.remove(s);
+    }
+    
+    public T lookup(Class c, String s) {
+        T result = null;
+        Map<String, T> table = get(c);
+        if (table != null)
+            result = table.get(s);
+        return result;
+    }
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/indication/AsArray.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge.indication;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface AsArray {
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/indication/Base64Encoded.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge.indication;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface Base64Encoded {
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/indication/Indicate.java

@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge.indication;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface Indicate {
+    // if later we want multiple indicated fields, use an int here
+}

AndroidStudio_projects/app/src/main/java/com/jilk/ros/rosbridge/indication/Indicated.java

@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) 2014 Jilk Systems, Inc.
+ * 
+ * This file is part of the Java ROSBridge Client.
+ *
+ * The Java ROSBridge Client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The Java ROSBridge Client is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Java ROSBridge Client.  If not, see http://www.gnu.org/licenses/.
+ * 
+ */
+package com.jilk.ros.rosbridge.indication;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface Indicated {
+    // if later we want multiple indicated fields, use an int here
+}